How does it feel like living under a rock? Why even have a mobile phone at this point then? Just get a landline wired telephone at home and at work instead.
But you don't understand the fact that this is how modern relationships work.
Internet and texting is where everything happens these days and you can't force your understanding of the world on your kids.
In this day and age, how can anyone even begin to have a relationship without being able to contact them when you want to? It is not something fancy, it's a basic necessity if you want your kid to not turn out a social pariah.