Adam, played by Kris Marshall, calls his mum on his BT landline at home for a long chat, but their conversation is interspersed with flashbacks to some of their previous, less successful phone calls from Adam's mobile.
The target audiences for the ad, which airs on Saturday, are families with children and empty nesters. The ad is by AMV.
The ad ends with the tagline: ‘If a conversation's worth having, use your landline. That's why BT gives you unlimited calls to UK landlines for just £4.95 a month.'
BT's Adam and Jane campaign, produced by AMV, has been running for more than four years.