Phones don't get hacked, but phone accounts do. Just google "simjacking" or "Sim swap fraud". All it takes is a little social engineering to get the representative at your phone company to move your number to a new phone, and now all the 2FA and password recovery texts from your bank are going to the scammer. T-Mobile has been hit with this pretty hard recently because scammers are able to use the data from the data breach to get into people's accounts.

She went to ATT today to change numbers. She was able to text through her phone on Friday but since then whenever any of us have been calling it goes to a random number.