first mobile phone..

My mum-in-law bought her first mobile phone. Its ringtone was the William Tell Overture.
"I'm getting lots of calls but they always hang up," she told my husband a few days later.
"That's odd," he said.
"I,ll phone you and see what happens."
He then dialed her number, but she sat motionless for more than a minute, but she sat motionless for more than a minute as her handset trilled away.
"Why aren't you answering?" he asked.
"Oh, sorry," she said.
"I thought I had to wait for the tune to finish."