The fixed telephone of telecom is the mobile phone number. What do you think of short messages?

I don't know your mobile phone brand, so I can't give a very specific answer, but there are two simple ways:

1- related to the operator, you can consult the customer service hotline 10000, and use this machine to make free calls;

2- For the telephone, you can read the instructions and call their customer service hotline.

Good luck!