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1. Get to Know Your Phone > Query and Change Service Settings

Query and Change Service Settings

You can dial numbers on your keypad to get billing information from your cellular operator or to configure forwarding settings.

If you’re a T-Mobile USA subscriber, you can dial #646# (#MIN#) [Hack #6] and a message will come back that tells you what your minute usage is for the billing period. You also can dial other little features on your phone to get interesting information or change network settings such as call forwarding.

On GSM networks, you can check the status of many services by sending messages from your handset to the operator’s network. Some GSM networks, such as T-Mobile USA, offer # codes, as shown in Table 1-4. You need to press the Call button (the green phone button you press after dialing a number) after you type in these numbers. Short * codes work in the same way—some of these are shown in Table 1-5. You should check your phone manual or your operator’s web site to learn which codes you can use.


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