Yes, you can, but of course AT&T would charge you with the roaming fees. But if you are looking into using a local SIM card in Italy, then you would need to unlock your AT&T phone first.
no
Sometimes... With T-Mobile and AT&T you can used the cellphones offered by these two companies with eachothers service. For example if you buy an unlocked i-phone (which is an AT&T phone) you can use it with T-Mobile. You can do this because they both use the GSM network which requires SIM cards. However you cannot use an unlocked sprint or Verizon type phone with T-Mobile or AT&T because they do not use the GSM network.
No, Alltel phones run off of CDMA and AT&T and T Mobile use GSM
Provided that the Android phone is a GSM-capable phone, and has some of the same bands that T-Mobile uses, then it is possible to use a T-Mobile sim card on it.
no
If you use a T-moblie prepaid phone and put your sim card from your old phone in the prepaid phone. Because I did it with at&t and it works with no hick-ups.. cheap replacement that's for sure.
what is a centennial phone??
no i hav the phone and i dont use it
i don,t have a phone but i have a watch a apple watch
T Mobile. Or At&T
Yes you can - the only difference is the way the phone-calls are paid for.
You can use the AT&T iPhone coupon code if you plan to purchase an iPhone. You can not use it if you plan to buy another phone.