Why does my iPhone 4 have no signal yet has full bars?

My phone is on EE and doesn't connect to the internet even though i have full 3g does anyone know why? I've tried resetting it everything and nothing seems to work it does this for about 3 hours a day?

Bars aren't always the best indicator of signal strength. Your best bet is to see the exact numeric signal strength measured in dBm. For a guide on how to access this info, check the source link below.

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