Tel-mobile is the name of the phone service provider.

The big clue here is the fact that Tel-Mobile is capitalised. If a phrase like this has initial capital letters you know that it is a name, in this case the name of a phone company. People's names, place names, company names, brand names - they are always capitalised. A native speaker would recognise this immediately as a company name, even if they had never heard of the company itself. Next time you see something capitalised in the middle of a sentence, just remember that it must be a proper name of some kind.