On Digital-only phones (Evo, hero, eris, incredible, most DroiRAB, etc), a 4xxxx PRL will not work.
4xxxx designates tri-band phones which include Analog (cancer-inducing, battery draining) signal. This is necessary in places like New York City for reasonable service.
Using 4xxxx.prl on, for example, an HTC Hero, will make the phone randomly not work, drop internet connection intermittently, and cause the phone to have erratic reception.
3xxxx prl's are digital only, 1x and 3g (evdo) PRL's, that are used for most modern phones.
The Ascend and other Cricket phones will get 4xxxx PRL's as a result of being tri-band phones, to take advantage of many of the tower/locations that Cricket has leased for their service.
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