Cool Cellphone codes?

  • Thread starter Thread starter Airuhn
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Airuhn

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I have a t mobile cell phone and learned that you can change the ring time up to 30 seconds) by typing **61*[voicemail number]*11*[time in seconds]#

and i learned there is a hidden reserve battery power by typing *3370#

But is there more? is there a list of codes for phones?
p.s. i have a samsung.
 
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