5. Cannot make or receive calls
Make sure that the phone is not off. Close the cover and switch on the phone.
If you get the message INVALID SIM CARD, your SIM cannot be used in the
communicator. Contact you dealer or network operator.
Check the status of your call barrings and diverts, see ”Telephone settings” on
page 65.
The phone may be busy: data or fax is being sent or received, or the
communicator is being used as a fax modem. Wait for the data/fax
transmission to end, or drop the call by pressing the
key on the phone
keypad.