iPhone useful secret codes

Shortcut Keys Description *#06# Displays your iPhone’s IMEI (International Mobile Equipment Identity) number *#21# Displays any call forwarding settings enabled on your iPhone. *#43# Shows you if call waiting for various parts of your phone are either enabled or disabled. *#30# Shows you if you have the call presentation (to see who is calling you) setting enabled or disabled. *#33# Displays call barring settings for your iPhone, and whether they are enabled or disabled. *3001#12345#* Opens up the “Field Test” settings on your iPhone, which allows you to see many, many advanced network settings on your phone including cell site information and more. *646# View available minutes on your AT&T plan. *777# View available minutes on your AT&T pre-paid plan (if you get the “Account Not Found” error, you do not have a pre-paid account and you should try the code just above this one for postpaid accounts). *3282# View wireless data usage statistics. *225# Check the bill balance on your AT&T account. *729 Makes a call to AT&T to pay your wireless bill.