Easy.
When the phone rings on the ground, do as you did, stop.
In the air, when it rings (a PA32 I assume!) just roll on 90 degrees of bank and pull the power back - nose falls, recover from the dive.
Then turn around and say - "please turn your phones off - it interferes with the electrical systems - as I told you prior to take off".
That'll do it. Peaceful flying from then on!