Ericsson F251m User Manual page 24

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Tip: if you already have an Internet connection configured for
the fixed line, you do not need to make any changes, just
connect your PC to the FCT line instead of the fixed line.
Warning!: if your modem is an old model and is not able to
send the CNG tone, you should include *02* previous to the
called number(B-number) in order to indicate the FCT that
the call to be made is a data call (Example: *02*B-number).
This is not usually necessary, as most modems automatically
send the CNG tone so that the data call is made automatically
by the FCT.
Incoming data calls are received in the same way as using the
fixed line.
Note: if you have a SIM card that does not support separate
voice and data numbers, the FCT does not recognize the type
of incoming call. This means that the calling party will have to
warn you each time a data call is about to be made. In this
case, dial *9902# to prepare your FCT to receive a data call.