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There is a customization and OEM file for the EPRS # codes which will allow you to change programing features on your phone. Luv2Chil is right about the towers. This is how VZW updates their PRL files, and roaming features. So Bell, Alltel and Sprint may have their own ways of updating.
I have used quite a few ROMs from this site, and various customizations from everyone, and never had a problem with the *228/*22899 codes. Then again I am a verizon user, sadly to say!
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