I guess your iphone 3G mobile phone restricted by some network,So only it won't accept your t-mobile sim card.So try to unlock your phone before put your T-mobile sim.For iphone unlocking visit Simpleunlocking.com and you can get free iphone unlock instructions from Mobileunlockguide.com I...
Using unlock code is the best way to unlock your T-mobile locked Samsung Galaxy S2 mobile phone.You can get an unlock code from your service provider or else try to buy an unlock code from online unlocking service provider.If you need an unlock code visit simpleunlocking.com Here they will need...