Internet speed capped at 40KB/s


hi,

i'm struggling bit iphone 4 , wondering if had heard of problem before. have searched through google can't seem find similar problem.

iphone 4 10 months old, have unlimited data package no fair usage policy has consistently given me download speed of 350 kb/s since bought it. use in work tethered macbook pro internet access , downloading files.

2 weeks ago noticed internet connection slow, thought might network problem , hoped sort out since internet speed not go above 40kb/s. downloaded app test speed of phone without being tethered computer , shows same results.

3g symbol disappears , have 'o' in it's place, way change restart phone. speed problem on 3g network though.

network provider says there no issues @ end, have done full factory restore, upgraded newest firmware, , suggested taking out sim, cleaning sim, rebooting phone , replacing sim. nothing has solved problem.

notice time time phone button unresponsive, though intermittent.

appreciated.
 



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