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Er, what exactly are you asking?

If your phone provider has capped your data usage then you will have to change your tariff to one with a higher limit.
 
Er, what exactly are you asking?

If your phone provider has capped your data usage then you will have to change your tariff to one with a higher limit.

No I mean when I want to download anything above 50mb on 3G it won't let me .. I have 3gb data plan, I want to turn off the 50mb limit from the iPhone App Store is it possible? Thanks
 
If I'm not mistaken there is a app for a jail broken phone that lets you trick your phone into thinking It's wifi, when your on 3G. I don't know anymore since I don't jailbreak.

But, Simple answer you have to jailbreak.
 
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