If you have a CDMA device like those found on Sprint and Verizon, you may need to update your Preferred Roaming List (PRL).The PRL is a list that allows your phone to roam off of towers that are not part of your native network, such as a sprint phone connecting to a former Alltel tower if none of its own are available.By updating the phone, the user will be able to get the best signal possible, whether it is roaming or within a home tower's range.Users who are having trouble with the signal on their phone will often be asked to first update the phone to ensure that the problem is not coming from a poor signal.Companies like T-Mobile have helped to shake things up a little bit, forcing others to change, but for the most part, carriers are involved in a love/hate relationship.From data caps to questionable extra fees, they don't exactly have the public on their side.Sadly, AT&T customers wouldn't receive the update to Lollipop for another several months. Said carrier must ensure it works properly on their network, and tests it before rolling out to customers.Why can it take several months for one group to receive an update over another? The process can be very time consuming, but we can't fault AT&T too much in the case of Lollipop landing on the 2nd gen Moto X.
Sprint has essentially done the same thing with its unlimited data plan.
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Is your phone not holding calls where it previously had a strong signal?
To update a Verizon phone, the star symbol followed by the number 228 should be dialed from a Verizon phone.
When prompted, choose the second option, after which the phone will begin to update and the call will end.