ICloud calling

iCloud calling is a free VoIP feature for Apple devices (especially non-sim Apple devices) which allows a Mac or iPad to use Wi-Fi (or cellular data on some iPads) to connect to a carrier using the generic access network method. It depends on carrier support; currently six carriers across three countries support the feature, in addition to several US-based MVNOs.

T-Mobile extends support to non-Apple devices via its "Digits" feature.

= Carrier support =

US (eight carriers and MVNOs)
T-Mobile and Verizon, as MVNO enablers, also provide iCloud calling to customers of four MVNOs:
 * AT&T (note: excludes Cricket customers)
 * T-Mobile (including Metro)
 * Verizon


 * Mint
 * Simple
 * Ting
 * Ultra

UK (one carrier)

 * EE

Hong Kong (two carriers)

 * 3 Hong Kong
 * SmarTone