The data in the PRL also controls the roaming indicator and banner on phones with a text service indicator banner. It can also be used to BLOCK phones from seeing specific systems that are in competion with the list creator's preferences. PRLs can be uploaded at service centers or downloaded via the OTASP (over the air service provision) interface. PRLs are changed as needed by the service provider. PRLs can also be different based on the service plan and region a customer has chosen.

One company's PRL assignments are shown below.
The names of the service plans are service marks of the company and are used only for illustration.

National PRLs	Oct 31 2003	Oct 1 2003	Aug 8 2003	May 30 2003	Mar 1 2003	Nov 22 2002	Oct 11 2002	July 22 2002	May 16 2002	Apr 19 2002	Feb 2002
Tri-Mode Default	50111	50108	50094	50083	50072	50067	50056	50047	50036	50027	50024
Americas ChoiceSM	50112	50109	50095	50084	50073	50068	50057	50048	50037	50028	50018
Americas ChoiceSM (ERI)	50113	50110	50096	50085	50074	50069	50058	50049	50038	50029	50019
National SingleRateSM	50114	50097		50086	50075	50059		50050	50039	50030	50022
National SR + Canada	50115	50098		50087	50076	50060		50051	50040	50031	50023
NSR (ERI)	50116	50099		50088	50077	50061		50052	50041	50032	50025
NSR + Canada (ERI)	50117	50100		50089	50078	50062		50053	50042	50033	50026
[Free-Up] VZW On-Net	50118	50101		50090	50079	50063		50045		50020
[Free-Up] VZW On-Net (ERI)	50119	50102		50091	50080	50064		50046		50021
Employees	50120	50103		50092	50081	50070	50065	50054	50043	50034
Employees (ERI)	50121	50104		50093	50082	50071	50066	50055	50044	50035

Numbers as identified by posters in newsgroups. PRLs in grey estimated.
PRLs 50105, 50106, 50107 not reported - posibly released in September in selected markets?
May 1st to May 30th, 2003: 50000 and 50001 were temporarily used for AC and AC-ERI in areas
most afflected by the changes to be released in 50084/85 for the price plan change on June 2nd.
It is unclear if 50045/46 relate to 50036-50042 or 50047-50055.
PRL 50024 was the first national "default" PRL with the introduction of AC.

PRL series including 50128 was released approximately Jan 30th, 2004, and apparently pulled soon after.
PRL series including 50143 was released approximately Feb 3rd, 2004.
PRL series including 50152 was released approximately Feb 19th. 2004.

ERI phones are ones with an Enhanced Roaming Indicator banner that gives text indication of what coverage you are in. Non-ERI phones do not display text but can still display a roaming indicator that is on, off, or flashing to denote the coverage. The PRL above that the customer's phone gets is based on what national plan the customer is on and what kind of phone (ERI or non-ERI) the customer has. If the customer is not on one of the national plans (America's Choice^SM, SingleRate^SM, or SingleRate^SM plus Canada) they will be given the 'tri-mode default' - unless their plan has a regional PRL below.

ERI phones will also have an ERI version, 50018 50019 or 50020, depending on what words are displayed for each roaming indication. For example, the messages in ERI 50019 are shorter than those in ERI 50018 to fit the width of the phone. The ERI version does not need to match the PRL version number.

Prior to the introduction of the PRLs above the company issued one PRL nationwide for most plans.

Older PRLs	Jan 2002	December 2001		Sep 2001	Jun 2001	May 2001		Jan 2001	2000
Tri-Mode Default	50017	50016	50015	50014	50013	50012	50011	50010	50006	50005

PRL 50017 was short lived and was "pulled due to errors".
PRL 50016 was released in the Carolinas and PRL 50015 in the west to "fix broadcast SID issues".
PRL 50014 was a national standard PRL, one of the first that was nationwide.
PRL 50013 was a quick fix that replaced PRL 50012 after one week of release.
PRL 50012 was for PCS areas and PRL 50011 for non-PCS areas (with 40004 for dual mode phones).
PRL 50010 was a standard PRL for non-PCS area.
Earlier PRLs were regionally issued based on the original coverage offered (A SYS, B SYS, or PCS).

With the introduction of 50024 came regional plan PRLs. These are used for regional and local plans within the regions shown. In general, the most current regional PRL will have the same structure as the most current national PRL but the roaming indicator will reflect the coverage that is part of the plan. In addition, there are PRLs for Dual-Mode phones (800MHz only grandfathered service) and for testing.

Eastern Region	10xxx
Midwest Region	20xxx
Southern Region	30xxx
Dual Mode Phones	40xxx
Western Region	42xxx
Special / Test PRLs	6xxxx

PRLs may be numbered 00001-65535. Other companies have chosen to use the numbering range in different ways. While the company above has chosen to update PRLs regularly other companies have kept their PRLs stable for quite some time.

Hopefully the above information has been interesting to see how one company has assigned PRL numbers (or PRL IDs) and how those numbers can be managed.