A Proxy Server is an easy way for a carrier to:
A) Reformat data in way that the phone's browser can see.
B) Prevent access to resources that shouldn't be accessed
C) Give all users internet access even when their account doesn't have internet.
Without C, you wouldn't be able to send picture mail in the manner that the phones do. This is why it's important that for pictures to work on your phone, internet must be configured correctly. C also provides the carrier a way for their customers to access their accounts from their phones without giving access to the internet at large.
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