Thread: T-mobile Phone with At&t SIM card?

I have an iphone 3gs and I have my old sidekick 3. I was wondering if i could put my iphones SIM card in the sidekick. Would it still work? I dont want to use the internet on it so that wouldnt be an issue. But If i works in the sidekick will it work when i put it back in?

Hi no you can't use your sim card in sidekick mobile if it is locked to some other network provider..To fix this you have to unlock your sidekick mobile from network lock ..You can easily unlock your sidekick 3 mobile using sites like Mobileunlocksolutions.com here they render unlock code for all mobile models at reliable cost ..After unlocking your mobile you can freely use it with old iphone sim card ....