Hidden GSM Codes on iPhone

Depending on your provider, there are many hidden network features you can use on your iPhone. For example you can set different time delays till your mailbox answers a call. You can also check your account balance or inclusive minutes. Just type in the GSM codes as if you where dialing a number on the iPhone. Some features need confirmation by pressing the call button. There are many codes out there. TUAW collects a useful list for US networks. In Germany T-Mobile provides a special page for their customers.

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