Virgin Mobile now uses sim cards and ATT and other carriers only what customers to use their phones, so the phones are locked for use only on their network. If you get an unlocked cell phone you can use it on any carrier that uses sim cards. NOTE: Tmobile and prepaid carriers don't have Iphones on the service.
if it's unlocked I think so, if not, procedures all over internet
An AT&T sim card will not work in an T-Mobile phone as it is locked to particular carrier itself... If you want to put your AT&T sim in your T-Mobile phone you can try unlocking your phone
Some cell phones are controlled with a SIM card. You may want to see if your AT&T SIM card will work a T-MOBILE phone.
It appears this can be done on most phones, however can be quite technical. The basic user of a mobile phone is unlikely to manage this successfully without assistance.
Could I put a simple mobile sin card to my HTC from ATT
If your phone plan includes mobile to mobile calling it does. If you're using prepaid it generally won't unless your on the $1 a day mobile to mobile plan.
No. The sim card would not be inter-carrier compatible.
No, it is actually a T-Mobile phone.
Yes as long as the phone is att and has a sim card slot
yes, but i wouldn't do that. It should work on any phone including t-mobile and att
Yes, provided your ATT phone is SIM unlocked.
if the phone is a prepaid phone, no. if it came on a plan, or bought outright, yes