If it's already locked on their network - yes. If it's on another carrier's network - no.
erm depends if its locked into a contract or not if it is be sure it is locked into the "3" network
yes
If your 3GS is locked, you can't insert a SIM card.
No it has to be unlocked
NO
How to unlock nokia C6 locked by bell canada
No, it is constantly being broken down and rebuilt.
If you bought an iPhone 5s from eBay and it is locked with a fingerprint lock, it will not be possible to unlock it if you do not have the Apple account.
Yes, you can use a Straight Talk SIM card in an AT&T iPhone, provided the phone is unlocked or compatible with Straight Talk's network. Straight Talk uses AT&T's network, so AT&T phones typically work well with their SIM cards. Just ensure that the iPhone is not locked to a specific carrier and that it supports the necessary bands for Straight Talk's service.
on my iphone 3g screen is locked so it can not spin anymore. How do I open it to spin again. thank you
Yes. The hack can bypasses iCloud security system for a locked iPhone 5.