Tel. #
You cannot abbreviate the number.
Your/his/her/their telephone (number) is
número de teléfono
For instance if your number was: 123-4567 it would look like 1-23-45-67 in spanish.
trd trd
Etcétera--- etc.
Sp. is usually the abbreviation for spanish (or Esp. if you were born in a Spanish speaking country).
The way that you would say what is the best telephone number to contact you at in Spanish would be cad é an uimhir theileafóin is fearr chun teagmháil a dhéanamh leat ag. If you just wanted to ask what is your telephone number you would say cad é d'uimhir ghutháin.
The abreviation of the worn "señora" is "Sra."
You can use por ej. that is a common abbreviation in Spanish.
Assuming you mean 'telephone number': Eso es mi numero de telefono
Usually the abbreviation for Spanish in an English-speaking context is "SP." The abbreviation for Spanish in an international context is "ESP" or "ES".