HT4993 My iPhone has barely any service while my dads same phone has full bars an I've reset network settings called ##873283# and nothing helps what should I do

My iPhone has barely any service while my dads same phone has full bars an I've reset network settings called ##873283# and nothing helps what should I do

take a look at this link   reset network settings http://www.apple.com/support/iphone/assistant/wifi/#section_5
My bad, it doesn't really give you the details that you were looking for.
For wifi - you would have to reenter the password.  I'm not sure about celluar data.

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