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Over the air updates are important because they synchronize your phone with the network.
If you've ever had an issue where your phone isn't successfully connecting to the network even though you're in a good coverage area, there's a strong chance that an over the air update will get your phone working again.
The PRL indicates which bands, sub bands and service provider identifiers will be scanned and in what priority order.
A profile update synchronizes your phone with the network by updating its network access info.For Sprint, it is ##873283# (it is also possible to use code ##72786# on Android or ##25327# on i OS to completely clear out the service programming and redo OTA activation, which includes updating the PRL).Each system table entry belongs to a geographic area known as a GEO. Each IS-95/1x RTT system is identified by either SID/NID or, in the case of enhanced PRL, SID/NID or MCC/MNC. IS-95/1x RTT and 1x EV-DO), association tags are used link an IS-95/1x RTT system with one or more 1x EV-DO systems.To support 1x EV-DO systems, the PRL must be IS-683-C or later. Hybrid systems always attempt to select an IS-95/1x RTT system first, then use the association tag to attempt to select an associated 1x EV-DO system.Each entry also provides an acquisition table index where the frequencies associated with that system are identified and a roaming indicator that dictates what type of indication should be displayed to the user when they are receiving service from that system.