Did you know that, within the European Union, there is “roaming or roaming without surcharges”? Calls (to mobiles and landlines), text messages (SMS) and data services are charged at the same rates that apply in the country of residence.
If you receive a call or text message during your stay abroad, you will not have to pay any additional cost either.
To call Spain or a Spanish number from abroad you must first dial +34 and then the phone number. The + symbol appears on the mobile when you keep the 0 key pressed.
Remember that to have internet abroad you must have your APN configured. You can see how to do it in the previous point.