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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.
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.
You can unblock in the message settings. For my phone, (S8500 Wave);
settings->applications->messages->general settings->block message
and select delete, then select the number you want to unblock and select delete again.
Might be slightly different process for different phones though.