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The problem is the IC inside the phone that is responsible for getting the signal. I believe it will be hard to repair since the cost of a single IC chip is just like buying a new phone so better buy a new one.
hi dude, sim is not valid, which mean ur sim might rejected , then only response will come like sim reg failed, or not valid, ur servise provider can only solve this probs. let u contact ur service provider,,and visit this site to unlock mobiles if u in this situation www.mobile-unlocker.com/
HI,
ERROR:The sim card is not valid.
SOLUTION:
1.Check the sim card with another mobile.
2.Else,the sim card is not registered(which displays the message "sim is not valid") and we have to call customer care and tell them to register your sim card.
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