Yes, provided your ATT phone is SIM unlocked.
if it's unlocked I think so, if not, procedures all over internet
An unlocked phone can accept the SIM card from any cell phone provider. If you have an ATT SIM card, you can use it in an unlocked phone. A locked phone is created by the provider to force the use of its service; an unlocked phone can take any SIM card.
You may be able to use it in this phone, the only way to find out is to try it.
To use internet on Sidekick phones, you would need to register the device for a Sidekick Data plan, as regular data plans do not work on these phones.
Absolutely, I do. ... Yea, but only if you buy it unlocked
No, it should not matter. As long as you have a Sidekick phone and you want to use internet on it, then register the phone for a Sidekick Data plan.
If you want to use internet on your Sidekick 08 phone, you would Sidekick Data plan for that.
Any cell phone that is unlocked requires a SIM card to work. If you own a Sidekick cell phone that is unlocked you are able to use a carrier other than T-Mobile. For this reason, it will require a SIM card to work.
If the Galaxy handset has been unlocked - yes.
None. You need to have a either an unlocked phone or an actual Metro PCS phone.
yes u can I had my att go phone unlocked and tried to use my sim card from st. talk which I found out uses att service towers in my area however, it didn't work. It stated "sim crash"