*#0011# This code shows the status information of your GSM network such as registration status, GSM band, etc.
*#0228# This code can be used to know about the battery status such as battery level, voltage, temperature etc.
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Get Even More Info on Call Forwarding: *#61#
On my Galaxy phone, this code prompted a pop-up that let me know how long until a call is forwarded to the message center.
