Updating cell phone tower list
The PRL is built by an operator and is normally not accessible to the user.
If you have an Android device, you can also check your PRL by tapping Home With Verizon prepping its LTE launch and Sprint lighting up new WIMAX markets, both carriers are spending a lot of time and resources ensuring their current 3G networks are optimized.
In the US, for Verizon / Metro PCS / US Cellular, this feature code is *228 (*ACT).
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).
This means a lot of adjustments to which towers cover a specific location, as well as the addition of new towers to handle additional traffic.
Because of this, it's a good idea to update your PRL at least once a month so your phone will always have access to the best coverage available in your area.