Ok if you are an iPhone user here are some keypad codes to get more information on your phone:

iPhone Codes: Network & Phone Information

*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.

*#06# – Displays your iPhone’s International Mobile Equipment Identity (IMEI) number (this code also works on many other phones).

*#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 weather they are enabled or disabled.

iPhone Codes: Carrier & Billing Information

*646# -View available minutes on your AT&T plan (*min#).

*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 (also *data#).

*225# – Check the bill balance on your AT&T account (also *bll#).

*729 – Makes a call to AT&T to pay your wireless bill.

from makeuseofit.com

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