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One of the reason why the signal drops is when the phone accidentally fell on the ground,some components like antenna might be dislocated or some parts might got lose contact,but in my case, before opening the phone,i tried to flash or reprogram the phone first using a gsm gadget(i am a cellphone technician that's why i have this tool),and well it is effective somehow.So it means it can be software problem or hardware problem in a way by dismantling the phone and check some parts like antenna and it's interface.
This problem occur when the phone gets dropped on a high place, water damage or setting on your mobile is changed.
Please follow this basic solution :
1. with the sim inserted on your phone, go to profile and select GENERAL. might you accidentally set your profile to offline mode.
2. check the simcard socket if its clean or well align,might corrosion is the problem that's why the sim fails to recognized.
3. Also clean the simcard itself using an pencil eraser.
4. align the battery terminal,might the power supply is not sufficient if the ground (middle terminal) doesn't reach the battery interface. as well as clean the battery connector.
If the above method doesn't work,consult a mobile service center for assistance,maybe the sim IC or some components related to insert sim problem maybe damage.
If you have already adjusted the volume of your cellphone, then the problem is in the earpiece. If the phone dropped accidentally the earpiece loosens its contact and you need to open the phone to adjust the contacts. If the phone was not dropped, the earpiece is busted and needs replacements.
Dear, its better to change it because its the matter of screen. the cracking will be increased day by day or as per usage. so better to change it so that it couldnt effect the phone.
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