If you are AT&T and the person you are calling is AT&T, then it is free.
ATT recently (Sept, 2014) announced that it will introduce WiFi calling for iPhone in 2015.
Yes as long as the phone is att and has a sim card slot
Could I put a simple mobile sin card to my HTC from ATT
Yes, provided your ATT phone is SIM unlocked.
An ATT universal card is a credit card. You apply for it like you do any other credit card, receive your limit, then spend. For more information you should visit the site for this, where you can find out rates and such.
ATT Customer Care (800-331-0500) will have the PUK Code for the SIM on all ATT model phones. Since this is an iphone, Apple (800 myiphone) can also help.
Yes, provided your ATT phone is SIM unlocked.
at 9:01. and ends at 6:59
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A sim card is a chip in your phone that holds information as to your phones identity such as your phone number. A sim card can be transferred to another phone allowing you to have to same phone number as well as your contacts.
no