I have iphone 4 and i used it for a one and half years.i used it in sri lanka and doha qatar,recently i update it i.o.s 7, then it was working.after i.o.s 7.0.3 came i again updeted it and now my phone network is not working.now phone is locked.pls help.

i have iphone 4 and i used it for a one and half years.i used it in sri lanka and doha qatar also..,recently i update it i.o.s 7, then it was working.after i.o.s 7.0.3 came i again updeted it and now my phone network is not working.now phone is locked.pls help.

I am seeing if I can get another battery even though I do not believe that is the issue.  It keeps giving me vdd_under which I believe is under voltage, maybe it is just a faulty battery?  It charges up like normal and functions normal (when plugged in, or above 90%) but it gives under voltage warnings and shuts down when in heavy use (using camera or going back and forth to imessage).  When just sitting idle it doesn't seem to turn off until that 55-60% mark.  It may just be a faulty battery because I feel I installed all of the other cables correctly when replacing the screen, and I don't think those connections should affect the battery anyway except for maybe the logic board cable (the 2nd cable to be unplugged after the battery cable) I guess I could clean that out as well with isopropyl just in case.
Any other suggestions would be helpful... and I will get back to you if a new battery helps.  Thanks!

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