I got reception problem in my 4g both gsm and wifi ? in form of very poor signal why*

i got reception problem in my 4g both gsm and wifi ? in form of very poor signal why*?? it was working fine suddenly the signal became bad and when i make phone call the other person on the seceond side doent hear me but when i use face time it is working , and the wifi signal is the same there is no or poor signal , signal improve only when i get closer to the modem that provides wifi at home or any wifi hot spot
is it antenna problem ? or what???

That thread helped for a time.  But now it seems as though my computer is back to slow again.  But, some of the jargon is over my head as well.  Not sure I knew quoite everything they were talking about.  But thanks a lot for that, it helped I probably just need to reread it and follow the instructions again.  Thanks so much.

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