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Do not worry the message as contact service means in your mobile a particular network is locked , so if you unlock it means you can use your mobile with any network........ In this way get the unlock code for your nokia 8250 model mobile from this site Unlock-free.com , here get the easy instructions for getting the code for your mobile from the network lock.............I hope it may helpful to you.....
if you recently accidentally drop your phone then you need to open it and reheat the cobba i.c or known as the audio i.c for some cellphone experts. you need to have the following things. hot air and a flux. first you need to put on a flux above the audio or cobba ic and reheat it using the hot air. set the hot air to its proper setting and slowly reheat the audio ic for 2 to 3 minutes. and then let it cool for 3 to 4 minutes and then close back your phone. then for sure it gonna have a signal.be careful of reheating the audio or cobba ic. since its sensitive and don't try to move it, just reheat it. coz if incase you move it, it will cause you phone to recieve a contact service error.
If you are a prepaid users the best thing you can do is buy a prepaid card. But before doing that, check if you still have remaining balance. If your you outstanding balance is not enough to send text message, that is the time you need to reload you prepaid credits. But if your a postpaid users, maybe your monthly bill is over due and you or your disconnected to the service. Call your service provider will help you on how to fix this problem.
open your unit using a T6 screwdriver, clean the part where the antenna is connected or made contact by an eraser. if still no signal, heat the parts using a hair blower for 5 seconds. be sure to remove the parts where the LCD and keypad tape, also remove plastic housing and other parts that may melt.