It is used to initially program the device opt 1, and it can be used to update the PRL list (cell tower addresses) on the device.
I had to call VZW yesterday with anissue and she walked me through calling *228 from my cell. She said I should do this once a week to update my phone with local towers.
Not sure about once a week, but after any upgrade you should allow VZW to re-program for both *228 Option 1 and *228 Option 2
I thought once a week was too often as well, just what she told me to do to insure I always had the latest list of tower updates. Could be because I live in an area where VZW was not here until they took over Alltel and they are still switching over towers in my area.
*228 is used to update your Preferred Roaming List (PRLs) and to activate devices. Use *228 to update your PRL about once a month. Once a week is overkill.
I just tried to use the *228 and it said that this feature is not available use *611. Without going to *611 (whatever that is) why would this feature not be available?
just did the *228, option #2, on my droid and it worked fine. i read on another board, about doing it monthly and especially after a software update. most say it improves the signal. mine did go from the usual 1 bar that i usually get at home to 3 bars, but it has only been an hour, so don't know long term effects.