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Alltel apparently has a "preferred home" area for your device. Basically it comprises of the local area around the origin of original purchase. Although you may travel to areas that are on preferred or even Alltel networks, you will recieve the solid roaming triangle (solid = roaming on un-preferred networks).
After updating to a 3.16 rom, I recieved the flashing roaming triangle (roaming on preferred networks). It does not make any sense and I have never been billed for "solid bar roaming"...
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