Most of them are tbh. My mums always annoying me, but I kept her saving my money because I got lucky, recieving a moon stone off of her just as my Nidorina needed evolving. The ones that irritate me the most though are the silly ones about how they almost caught an easy low level pokemon but didn't quite. It just seems a bit trivial after I've just beaten the elite. lol. I think the phone could be pretty good if it had more of a use, but as it is, feels more like a gimmick.
It does have a use. After meeting certain conditions, you can call all the gym leaders for new, much harder battles. And you can do it as many times as you want in a row. Great for training.