telephone numbers for alerts

Hi all, New here and to the mobile security too and hoping someone can help!

I have unlimited minutes and texts to UK numbers only and wonder when the app sends out a request to like your phone etc is this a UK number it uses? I’d like to set up my phone to do this but it may cost a fortune for all I kbow!

cheers in advance for your help

Can you please specify your request? Are you talking about antitheft?