Radio Shack CT-400 User Manual
29
SID SCREENING
If two different cellular market areas are located
close to one another, a call designated for the A (or
B) carrier in one market can sometimes be placed
using the A (or B) carrier located in the other mar-
ket area. This can result in unwanted roaming and
higher charges.
close to one another, a call designated for the A (or
B) carrier in one market can sometimes be placed
using the A (or B) carrier located in the other mar-
ket area. This can result in unwanted roaming and
higher charges.
At the time of activation, a code is programmed into
your phone that uniquely identifies your cellular
carrier. To prevent unwanted roaming, your
phone’s System IDentity (SID) screening feature
lets you set your phone to look for your designated
carrier’s code signal each time you place a call, so
the calls you place use
your phone that uniquely identifies your cellular
carrier. To prevent unwanted roaming, your
phone’s System IDentity (SID) screening feature
lets you set your phone to look for your designated
carrier’s code signal each time you place a call, so
the calls you place use
only your carrier.
Notes:
• If SID screening is set to ON and the phone
cannot locate your designated carrier’s code
signal, only emergency calls to the emergency
number programmed into your phone can go
through. Other calls will not go through, and
the phone will not roam.
signal, only emergency calls to the emergency
number programmed into your phone can go
through. Other calls will not go through, and
the phone will not roam.
appears
(with
flashing).
• When SID screening is set to OFF, your phone
automatically roams according to the selected
cellular system type (see “Setting the Cellular
System Type” on Page 26).
cellular system type (see “Setting the Cellular
System Type” on Page 26).
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SVC
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