SIM card lock or Network lock is a restriction put in by the service provider that would not allow the user to use a SIM card from a different carrier. In order for a owner to easily switch SIM cards from different GSM carriers, the phone must first be unlocked.
No as they may be locked to a particular handset but if they are not you can move the SIM card to an other handset. Nokia do not have their own SIM cards they just lock the SIM card to their network via the SIM card settings.
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SIM lock on E250
If you are being asked for the PUK code or the PIN code, then your service provider to have them assist you with that. You can only obtain the PUK or PIN code from the service provider.
It shouldnt do anything to your Sim Card, your phone number, etc. If you really want to be safe, just remove the sim before resetting. Either one of these may lock your sim card, so make sure you know the code! If you don't, just contact your cellular provider
There's a SIM card tray on the top of the phone between the headphone jack and the lock button. It can be opened with a pin or the SIM tray opening tool that came with the iPhone.
If you have permanently locked a SIM card then you will need to request one from your provider. Most cases they will issue you 1 free for the first time but if you continue to lock them then they will charge you
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YES it should although if its jailbroken/unlocked it will lock
The plural form of SIM card is SIM cards.
sim card