He was told multiple times to put the phone away, then he starts getting all "I have a right to phone my sister" BS. Another mouthy gobshite that's still wondering what hit him
Do the police have the right to stop him from making phone calls?
I tried googling for the answer on this, but couldn't find anything definitive. You're supposed to obey the officers' orders during a stop, but if they give an order outside of their authority to give, then that wouldn't apply.
Did his having the phone prevent him from answering a single one of their questions? Having an additional witness to the interaction could be a positive thing. If there's not a specific rule preventing him from calling his sister, then he'd be correct that he had the right to do so.