If the Galaxy handset has been unlocked - yes.
Could I put a simple mobile sin card to my HTC from ATT
if the phone is a prepaid phone, no. if it came on a plan, or bought outright, yes
I want to make sure I answer this question, after talking to tmobile, because there is sites that want to charge 40 bucks for unlocking your phone and I called T-Mobile asking if they would unlock the T-Mobile phone for use with boost Mobile and they said no problem. It takes about 24 hours and they email you the unlock code with instructions on how to do it. I guess it would be worth the money if you still had a contact or something but other then that... It's free!
Boost mobile phones and AT&T mobile phones are very similar. In fact, some of the phones are identical. While Boost definitely is cheaper for service, I can't say that their phones are any better.
Att and Boost Mobile have great pre-paid plans and new touch screen and smart phones for a good price.. Also it counts on your area where you live..Att has better coverage,,boost mobile is spotty on the rural areas...
T-Mobile and ATT usually have great data plans and I'm thinking ATT to be the cheaper of the 2 with unlimited data plans. I heard that boost and virgin mobile are good as well.
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.
ONLY if the handset has been unlocked from any network.
No. The sim card would not be inter-carrier compatible.
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.
Yes as long as the phone is att and has a sim card slot
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