These are sony xperia tipo secret codes, which will open hidden menus on your phone. To activate these codes, simply open the phone-dial menu, and then dial the code just like you're about to make a phone call. I think these codes won't harm your phone, but do be careful, back up first, do at your own risk.
| Code | Effect |
| *#*#7378423#*#* | Service Menu |
| *#*#4636#*#* | Testing Menu |
| *#*#8255#*#* | GTalk Service Monitor |
| *#06# | Show IMEI |
Source : www.verygoodreview.com
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