There's a lot of factors for signal.
PRL
Radio
Phone
Location
Also have you tried *22804?
What plan are you on?
How does you phone appear to be listed on the account?
Which PRL is the best? This is going to depend on trial and error. Some will say the one you have now is good, others will say that 35613 is the best. I would start with prl first, then if that doesn't solve it after trying a couple different ones see if there's a radio update for the phone.
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