I bouth the sidekick II, carrier with suncom. I put my sim card into de cell phone, but the phone not recognized it. When I try to make a call, in the screen appear a message that say Hardware problem and appear (code NET7). My email address is firstname.lastname@example.org.
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Yes, on an unlocked phone you can easily switch SIM cards. All you can do is put the T-Mobile SIM card in the phone and it should show signal bars on the top of the phone. If not you can call up T-Mobile and ask them for correct network settings and they should be able to help you out with this.
If the phone is not unlocked it wont work with any other sim card except the original carrier SIM card. In this case you first need to unlock it.
I am posting the link below incase you need unlock code for your device:
Could be the PUK (Pin UnlocK code) which your provider will have. Could be a handset restriction code ie, if you are putting another carriers sim in a phone that is 'locked' to a specific carrier. Again, provider will help you with this on;
OR, could be anything, we really need more info, what screen, what is it asking, what are the surrounding circumstances.