Uniden PCD1087 - Manual (Page 38)

You may hear a recording (no airtime charge) that gives
procedures for roaming calls and connects you
immediately (during business hours) to a registration
clerk. If you cannot obtain roaming services on one
carrier, try switching to the other type. It is important to
remember that the ROAM indicator does not mean the
phone is authorized to make calls; only that a system
other than the Home system is detected.
SID (System Identification)
In general, metropolitan areas are served by more that
one service provider. Under certain circumstances you
may be roaming in an area that has two A systems or two
B systems that overlap, and you could be charged two
roaming charges. To prevent this double charging,
program the System Identification Number (SID) for that
area and then activate the number when you are in that
location. (You will get the SID form the service provider in
that location.)
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