Iphone 3gs only picking up 3G when i travel to another district? - 1

Any help would be greatly appreciated,

When i got the phone it was jail-broken, i removed the jailbreak and continued using the phone with-out problem except not being able to pick up 3G… When i drive around 10 miles or more from my city i pick up 3G, strange and annoying!

Heres the facts

Phone was jail-broken (now removed)
2G sim upgraded to a 3G sim
phone has been flashed with latest firmware today
phone has been factory reset
network settings have also been reset
100% sure my area has 3G
only works when i drive around 10 miles away from the city
not a hardware problem
'enable 3g' is selected
phone is on 02

version 6.1.3
modem firmware 05.16.08
carrier o2 14.0

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