PMB9955

The Intel PMB9955 is the baseband chip used in the Apple Watch Series 4, Apple Watch Series 5, Apple Watch SE, Apple Watch Series 6, Apple Watch Series 7, Apple Watch SE, Apple Watch Series 8, Apple Watch Ultra, iPad Pro (11-inch), iPad Pro (12.9-inch) (3rd generation), iPad Air (3rd generation), iPad mini (5th generation), iPad (7th generation), iPad (8th generation), iPad (9th generation), iPhone XR, iPhone XS and iPhone XS Max. It is responsible for transmitting simultaneous voice and data transfer on LTE (provided the carrier has the infrastructure to allow simultaneous voice and data transfer.)

it is also known as  for iOS/iPadOS and   for watchOS in firmware.

watchOS
1.00.03    5.0            (Build 16R364) 5.0.1         (Build 16R381) 1.01.02    5.1 beta       (Build 16R5559d) 1.01.03    5.1 beta 2     (Build 16R5568d) 1.01.04    5.1 beta 3     (Build 16R5577c) 5.1 beta 4    (Build 16R5584a) 5.1 beta 5    (Build 16R5589c) 5.1           (Build 16R591) 5.1.1         (Build 16R600) 1.02.02    5.1.2 beta     (Build 16S5042a) 5.1.2 beta 2  (Build 16S5046a) 5.1.2         (Build 16S46) 1.03.00    5.1.3 beta     (Build 16S5523a) 1.03.01    5.1.3 beta 2   (Build 16S5531a) 5.1.3 beta 3  (Build 16S5535a) 5.1.3         (Build 16S535) 1.04.01    5.2 beta       (Build 16T5181f) 5.2 beta 2    (Build 16T5191d) 1.04.02    5.2 beta 3     (Build 16T5201c) 1.04.05    5.2 beta 4     (Build 16T5212e) 5.2 beta 5    (Build 16T5222a) 5.2 beta 6    (Build 16T5225a) 5.2           (Build 16T225) 1.04.03    5.2.1 beta     (Build 16U5079d) 5.2.1 beta 2  (Build 16U5091b) 1.04.05    5.2.1 beta 3   (Build 16U5101c) 5.2.1 beta 4  (Build 16U5110a) 5.2.1 beta 5  (Build 16U5113a) 5.2.1         (Build 16U113) 5.3 beta      (Build 16U5526f) 5.3 beta 2    (Build 16U5537b) 5.3 beta 3    (Build 16U5545c) 5.3 beta 4    (Build 16U5558b) 5.3 beta 5    (Build 16U5566a) 5.3 beta 6    (Build 16U5569a) 5.3           (Build 16U569) 5.3.1         (Build 16U600) 5.3.2         (Build 16U611) 5.3.3         (Build 16U620) 5.3.4         (Build 16U627) 5.3.5         (Build 16U652) 5.3.6         (Build 16U662) 5.3.7         (Build 16U674) 5.3.8         (Build 16U680) 5.3.9         (Build 16U693) 1.51.02    6.0 beta       (Build 17R5491t) 6.0 beta 2    (Build 17R5507l) 1.53.23    6.0 beta 3     (Build 17R5521e) 1.54.21    6.0 beta 4     (Build 17R5532f) 1.55.03    6.0 beta 5     (Build 17R5546f) 2.00.01    6.0 beta 6     (Build 17R5556d) 6.0 beta 7    (Build 17R5566a) 6.0 beta 8    (Build 17R5571a) 6.0 beta 9    (Build 17R5575a) 6.0 GM        (Build 17R575) 6.0           (Build 17R575) 2.00.03    6.0.1          (Build 17R604 & 17R605) 2.01.03    6.1 beta       (Build 17S5054e) 6.1 beta 2    (Build 17S5059e) 2.01.04    6.1 beta 3     (Build 17S5068e) 6.1 beta 4    (Build 17S5076a) 6.1 beta 5    (Build 17S5083a) 6.1           (Build 17S84) 2.01.03    6.1.1 beta     (Build 17S5433b) 2.01.04    6.1.1 beta 2   (Build 17S5439a) 6.1.1 beta 3  (Build 17S5446a) 6.1.1 beta 4  (Build 17S5449b) 6.1.1         (Build 17S449) 2.01.03    6.1.2 beta     (Build 17S5775c) 2.02.00    6.1.2 beta 2   (Build 17S5792a) 6.1.2 beta 3  (Build 17S5796a) 6.1.2         (Build 17S796) 6.1.3         (Build 17S811) 2.03.02    6.2 beta       (Build 17T5224g) 2.03.04    6.2 beta 2     (Build 17T5234f) 2.03.05    6.2 beta 3     (Build 17T5244c) 6.2 beta 4    (Build 17T5251a) 6.2 beta 5    (Build 17T5254a) 6.2 beta 6    (Build 17T529) 6.2           (Build 17T529) 2.03.04    6.2.5 beta     (Build 17T5580e) 2.04.01    6.2.5 beta 2   (Build 17T5590d) 6.2.5 beta 3  (Build 17T5600c) 6.2.5 beta 4  (Build 17T5607a) 6.2.5 beta 5  (Build 17T608) 6.2.5         (Build 17T608) 6.2.6         (Build 17T620) 6.2.8 beta    (Build 17U5535e) 6.2.8 beta 2  (Build 17U5545c) 6.2.8 beta 3  (Build 17U5559d) 6.2.8 GM      (Build 17U63) 6.2.8         (Build 17U63) 6.3           (Build 17U216) 2.50.25    7.0 beta       (Build 18R5310a) 2.50.27    7.0 beta 2     (Build 18R5327h) 2.50.29    7.0 beta 3     (Build 18R5340d) 2.50.31    7.0 beta 4     (Build 18R5350e) 3.00.01    7.0 beta 5     (Build 18R5361d) 7.0 beta 6    (Build 18R5368d) 3.00.02    7.0 beta 7     (Build 18R5378a) 7.0 beta 8    (Build 18R5382a) 7.0 GM        (Build 18R382) 7.0           (Build 18R382) 7.0.1         (Build 18R395) 7.0.2         (Build 18R402) 3.01.03    7.1 beta       (Build 18R5552f) 3.01.04    7.1 beta 2     (Build 18R5561e) 3.01.07    7.1 beta 3     (Build 18R5572f & 18R5572g) 7.1 beta 4    (Build 18R5585a & 18R5586a) 7.1 RC        (Build 18R589) 7.1           (Build 18R590) 7.2 beta      (Build 18S5545f) 7.2 beta 2    (Build 18S5555c) 7.2 beta 3    (Build 18S5561a) 7.2 RC        (Build 18S563) 7.2           (Build 18S563/18S564) 3.01.06    7.3 beta       (Build 18S5780d) 3.01.07    7.3 beta 2     (Build 18S5793d) 7.3 RC        (Build 18S801) 7.3           (Build 18S801) 7.3.1         (Build 18S811) 7.3.2         (Build 18S821) 7.3.3         (Build 18S830) 3.03.03    7.4 beta       (Build 18T5144k) 3.03.04    7.4 beta 2     (Build 18T5159f) 3.03.05    7.4 beta 3     (Build 18T5169f) 7.4 beta 4    (Build 18T5183b) 7.4 beta 5    (Build 18T5190a) 7.4 beta 6    (Build 18T5193a) 7.4 beta 7    (Build 18T5194a) 7.4 RC        (Build 18T195) 7.4           (Build 18T195) 7.4.1         (Build 18T201) 3.04.00    7.5 beta       (Build 18T5546f) 7.5 beta 2    (Build 18T5555c) 7.5 beta 3    (Build 18T5564a) 7.5 RC        (Build 18T567) 7.5           (Build 18T567) 3.03.04    7.6 beta       (Build 18U5523d) 3.05.00    7.6 beta 2     (Build 18U5533b) 7.6 beta 3    (Build 18U5542b) 7.6 beta 4    (Build 18U5552d) 7.6 beta 5    (Build 18U5561a) 7.6 RC        (Build 18U63) 7.6           (Build 18U63) 7.6.1         (Build 18U70) 7.6.2         (Build 18U80) 3.50.16    8.0 beta       (Build 19R5266q) 3.50.17    8.0 beta 2     (Build 19R5286f) 3.50.18    8.0 beta 3     (Build 19R5302f) 3.50.19    8.0 beta 4     (Build 19R5312e) 3.50.20    8.0 beta 5     (Build 19R5323g) 4.00.00    8.0 beta 6     (Build 19R5330d) 8.0 beta 7    (Build 19R5340a) 8.0 beta 8    (Build 19R5342a) 8.0 RC        (Build 19R346) 8.0           (Build 19R343 & 19R346) 8.0.1         (Build 19R354) 3.50.20    8.1 beta       (Build 19R5541f) 8.1 beta 2    (Build 19R5551d) 4.00.00    8.1 beta 3     (Build 19R5559e) 8.1 beta 4    (Build 19R5566a) 8.1 RC        (Build 19R570) 8.1           (Build 19R570) 8.1.1         (Build 19R580) 3.50.20    8.3 beta       (Build 19S5026e) 4.01.00    8.3 beta 2     (Build 19S5036d) 4.01.01    8.3 beta 3     (Build 19S5044c) 8.3 beta 4    (Build 19S5050c) 8.3 RC        (Build 19S55) 8.3           (Build 19S55) 4.01.00    8.4 beta       (Build 19S5525f) 4.01.01    8.4 beta 2     (Build 19S5539e) 8.4 RC        (Build 19S546) 8.4           (Build 19S546) 8.4.1         (Build 19S550) 8.4.2         (Build 19S553) 4.01.00    8.5 beta       (Build 19T5212h) 4.02.00    8.5 beta 2     (Build 19T5223e) 4.02.01    8.5 beta 3     (Build 19T5228d) 8.5 beta 4    (Build 19T5238a) 8.5 beta 5    (Build 19T5241a) 8.5 RC        (Build 19T242) 8.5           (Build 19T242) 8.5.1         (Build 19T252) 4.03.00    8.6 beta       (Build 19T5547f) 8.6 beta 2    (Build 19T5557d) 8.6 beta 3    (Build 19T5562f) 4.03.01    8.6 beta 4     (Build 19T5570a) 8.6 RC        (Build 19T572) 8.6           (Build 19T572) 4.03.00    8.7 beta       (Build 19U5027c) 8.7 beta 2    (Build 19U5037d) 8.7 beta 3    (Build 19U5046b) 4.03.01    8.7 beta 4     (Build 19U5056c) 8.7 beta 5    (Build 19U5063a) 8.7 RC        (Build 19U66) 8.7           (Build 19U66) 4.50.22    9.0 beta       (Build 20R5287q) 4.50.25    9.0 beta 2     (Build 20R5307h) 4.50.27    9.0 beta 3     (Build 20R5316f) 4.50.29    9.0 beta 4     (Build 20R5332g) 5.00.00    9.0 beta 5     (Build 20R5343e) 9.0 beta 6    (Build 20R5353a) 9.0 beta 7    (Build 20R5359a) 9.0 RC        (Build 20R361) 9.0           (Build 20R361 & 19R364) 5.01.00    9.1 beta       (Build 20S5044e) 9.1 beta 2    (Build 20S5049d)

iOS and iPadOS
1.00.07    12.0           (Build 16A366) 1.00.08    12.0           (Build 16A367) - (iPhone XR only) 12.0.1        (Build 16A405) 1.01.12    12.1 beta      (Build 16B5059d) 1.01.20-1  12.1 beta 2    (Build 16B5068i) 1.01.27    12.1 beta 3    (Build 16B5077c) 1.01.29    12.1 beta 4    (Build 16B5084a) 1.01.30    12.1 beta 5    (Build 16B5089b) 12.1          (Build 16B92, 16B93 & 16B94) 1.02.09    12.1.1 beta    (Build 16C5036c) 1.02.16    12.1.1 beta 2  (Build 16C5043b) 1.02.18    12.1.1 beta 3  (Build 16C5050a) 12.1.1        (Build 16C50) 1.03.02    12.1.2 beta    (Build 16D5024a) 1.02.18    12.1.2         (Build 16C101 & 16C104) 1.03.05    12.1.3 beta 2  (Build 16D5032a) 1.03.07    12.1.3 beta 3  (Build 16D5037a) 1.03.08    12.1.3 beta 4  (Build 16D5039a) 12.1.3        (Build 16D40) 12.1.4        (Build 16D57) 1.04.10    12.2 beta      (Build 16E5181f) 1.04.13    12.2 beta      (Build 16E5191d) 1.04.21-2  12.2 beta 3    (Build 16E5201e) 1.04.28    12.2 beta 4    (Build 16E5212f) 1.04.30    12.2 beta 5    (Build 16E5223a) 12.2 beta 6   (Build 16E5227a) 12.2          (Build 16E227) 1.05.00    12.3 beta      (Build 16F5117h) 1.05.01    12.3 beta 2    (Build 16F5129d) 1.05.02    12.3 beta 3    (Build 16F5139e) 1.05.03    12.3 beta 4    (Build 16F5148a) 12.3 beta 5   (Build 16F5155a) 12.3 beta 6   (Build 16F5156a) 12.3          (Build 16F156) 1.05.04    12.3.1         (Build 16F203) 1.06.01    12.4 beta      (Build 16G5027g) 12.4 beta 2   (Build 16G5027i) 1.06.02    12.4 beta 3    (Build 16G5038d) 12.4 beta 4   (Build 16G5046d) 12.4 beta 5   (Build 16G5056d) 12.4 beta 6   (Build 16G5069a) 12.4 beta 7   (Build 16G5077a) 12.4          (Build 16G77) 12.4.1        (Build 16G102) 1.50.23    13.0 beta      (Build 17A5492t) 1.51.07    13.0 beta 2    (Build 17A5508m) 1.52.04    13.0 beta 3    (Build 17A5522f & 17A5522g) 1.53.02    13.0 beta 4    (Build 17A5534f) 1.54.04    13.0 beta 5    (Build 17A5547d) 2.00.01    13.0 beta 6    (Build 17A5556d) 2.00.01-2  13.0 beta 7    (Build 17A5565b) 13.0 beta 8   (Build 17A5572a) 2.00.01    13.0 GM        (Build 17A577) 13.0          (Build 17A577) 2.01.07    13.1 beta      (Build 17A5821e) 2.01.08    13.1 beta 2    (Build 17A5831c) 13.1 beta 3   (Build 17A5837a) 13.1 beta 4   (Build 17A5844a) 13.1          (Build 17A844) 13.1.1        (Build 17A854) 13.1.2        (Build 17A860 & 17A861) 13.1.3        (Build 17A878) 2.02.08    13.2 beta      (Build 17B5059g) 2.02.10-1  13.2 beta 2    (Build 17B5068e) 2.02.12    13.2 beta 3    (Build 17B5077a) 13.2 beta 4   (Build 17B5084a) 13.2          (Build 17B84) 13.2.2        (Build 17B102) 13.2.3        (Build 17B111) 2.03.04    13.3 beta      (Build 17C5032d) 2.03.07    13.3 beta 2    (Build 17C5038a) 13.3 beta 3   (Build 17C5046a) 13.3 beta 4   (Build 17C5053a) 13.3          (Build 17C54) 2.04.00    13.3.1 beta    (Build 17D5026c) 2.04.03    13.3.1 beta 2  (Build 17D5044a) 13.3.1 beta 3 (Build 17D5050a) 13.3.1        (Build 17D50) 2.05.09    13.4 beta      (Build 17E5223h) 2.05.10    13.4 beta 2    (Build 17E5233g) 2.05.13    13.4 beta 3    (Build 17E5241d) 13.4 beta 4   (Build 17E5249a) 13.4 beta 5   (Build 17E5255a) 13.4 beta 6   (Build 17E255) 13.4          (Build 17E255) 13.4.1        (Build 17E262) 2.06.00    13.4.5 beta    (Build 17F5034c) 13.4.5 beta 2 (Build 17F5044d) 13.5 beta 3   (Build 17F5054h) 13.5 beta 4   (Build 17F5065a) 13.5 GM       (Build 17F75) 13.5          (Build 17F75) 13.5.1        (Build 17F80) 13.5.5 beta   (Build 17G5035d) 2.07.00    13.6 beta 2    (Build 17G5045c) 13.6 beta 3   (Build 17G5059c) 13.6 GM       (Build 17G68) 13.6          (Build 17G68) 13.6.1        (Build 17G80) 13.7 beta     (Build 17H33) 13.7          (Build 17H35) 2.50.07    14.0 beta      (Build 18A5301v) 2.50.09    14.0 beta 2    (Build 18A5319i) 2.50.12    14.0 beta 3    (Build 18A5332f) 2.50.13    14.0 beta 4    (Build 18A5342e) 2.50.15    14.0 beta 5    (Build 18A5351d) 3.00.01    14.0 beta 6    (Build 18A5357e) 14.0 beta 7   (Build 18A5369b) 14.0 beta 8   (Build 18A5373a) 14.0 GM       (Build 18A373) 14.0          (Build 18A373) 14.0.1        (Build 18A393) 14.1 GM       (Build 18A8395) 14.1          (Build 18A8395) 3.01.00    14.2 beta      (Build 18B5052h & 18B5052i) 14.2 beta 2   (Build 18B5061e) 3.01.01    14.2 beta 3    (Build 18B5072f) 14.2 beta 4   (Build 18B5083a) 14.2 RC       (Build 18B91) 14.2          (Build 18B92) 3.02.02    14.3 beta      (Build 18C5044f) 14.3 beta 2   (Build 18C5054c) 14.3 beta 3   (Build 18C5061a) 14.3 RC       (Build 18C65) 14.3 RC 2     (Build 18C66) 14.3          (Build 18C66) 3.02.01    14.4 beta      (Build 18D5030e) 3.02.02    14.4 beta 2    (Build 18D5043d) 14.4 RC       (Build 18D52) 14.4          (Build 18D52) 14.4.1        (Build 18D61) 14.4.2        (Build 18D70) 3.03.02    14.5 beta      (Build 18E5140j & 18E5140k) 3.03.03    14.5 beta 2    (Build 18E5154f) 3.03.05    14.5 beta 3    (Build 18E5164h) 14.5 beta 4   (Build 18E5178a) 14.5 beta 5   (Build 18E5186a) 14.5 beta 6   (Build 18E5194a) 14.5 beta 7   (Build 18E5198a) 14.5 beta 8   (Build 18E5199a) 14.5 RC       (Build 18E199) 14.5          (Build 18E199) 14.5.1        (Build 18E212) 14.6 beta     (Build 18F5046e & 18F5046f) 3.04.01    14.6 beta 2    (Build 18F5055b) 14.6 beta 3   (Build 18F5065a) 14.6 RC       (Build 18F71) 14.6 RC 2     (Build 18F72) 14.6          (Build 18F72) 3.03.04    14.7 beta      (Build 18G5023c) 14.7 beta 2   (Build 18G5033e) 3.04.01    14.7 beta 3    (Build 18G5042c) 14.7 beta 4   (Build 18G5052d) 14.7 beta 5   (Build 18G5063a) 14.7 RC       (Build 18G68) 14.7          (Build 18G69 & 18G70) 14.7.1        (Build 18G82) 3.05.00    14.8           (Build 18H17) 14.8.1        (Build 18H107) 3.50.04    15.0 beta      (Build 19A5261w) 3.50.06    15.0 beta 2    (Build 19A5281h & 19A5281j) 3.50.07    15.0 beta 3    (Build 19A5297e) 3.50.08    15.0 beta 4    (Build 19A5307g) 3.50.09    15.0 beta 5    (Build 19A5318f) 4.00.00    15.0 beta 6    (Build 19A5325f) 15.0 beta 7   (Build 19A5337a) 15.0 beta 8   (Build 19A5340a) 15.0 RC       (Build 19A344) 15.0          (Build 19A346) 15.0.1        (Build 19A348) 15.0.2        (Build 19A404) 3.50.09    15.1 beta      (Build 19B5042h) 4.01.00    15.1 beta 2    (Build 19B5052f) 4.01.01    15.1 beta 3    (Build 19B5060d) 15.1 beta 4   (Build 19B5068a) 15.1 RC       (Build 19B74) 15.1          (Build 19B74) 4.02.00    15.2 beta      (Build 19C5026i) 4.02.01    15.2 beta 2    (Build 19C5036e) 4.02.02    15.2 beta 3    (Build 19C5044b) 15.2 beta 4   (Build 19C5050b) 15.2 RC       (Build 19C56) 15.2          (Build 19C56) 15.2.1        (Build 19C63) 4.02.01    15.3 beta      (Build 19D5026g) 4.02.02    15.3 beta 2    (Build 19D5040e) 15.3 RC       (Build 19D49) 15.3          (Build 19D50) 15.3.1        (Build 19D52) 4.03.00    15.4 beta      (Build 19E5209h) 4.03.01    15.4 beta 2    (Build 19E5219e) 4.03.02    15.4 beta 3    (Build 19E5225g) 15.4 beta 4   (Build 19E5235a) 15.4 beta 5   (Build 19E5241a) 15.4 RC       (Build 19E241) 15.4          (Build 19E241) 15.4.1        (Build 19E258) 4.04.01    15.5 beta      (Build 19F5047e) 15.5 beta 2   (Build 19F5057e) 4.04.02    15.5 beta 3    (Build 19F5062g) 15.5 beta 4   (Build 19F5070b) 15.5 RC       (Build 19F77) 15.5          (Build 19F77) 4.04.01    15.6 beta      (Build 19G5027e) 15.6 beta 2   (Build 19G5037d) 15.6 beta 3   (Build 19G5046d) 4.04.02    15.6 beta 4    (Build 19G5056c) 15.6 beta 5   (Build 19G5063a) 15.6 RC       (Build 19G69) 15.6 RC 2     (Build 19G71) 15.6          (Build 19G71) 15.6.1        (Build 19G82) 15.7 RC       (Build 19H12) 15.7          (Build 19H12) 4.50.01    16.0 beta      (Build 20A5283p) 4.50.02    16.0 beta 2    (Build 20A5303i) 16.0 beta 3   (Build 20A5312g & 20A5312j) 4.50.03    16.0 beta 4    (Build 20A5328h) 5.00.01    16.0 beta 5    (Build 20A5339d) 16.0 beta 6   (Build 20A5349b) 16.0 beta 7   (Build 20A5356a) 16.0 beta 8   (Build 20A5358a) 16.0 RC       (Build 20A362) 16.0          (Build 20A362) 5.01.00    16.1 beta      (Build 20B5027f) 16.1 beta 2   (Build 20B5045d) 16.1 beta 3   (Build 20B5050f)