In the light-hearted advert Dame Joan jokingly refers to her past relationships while sitting on a yacht in St Tropez.
In the advert she joked: “I’ve never settled for anyone or anything that didn’t float my boat… It’s now easier than ever to switch.
“So darling if they’re not satisfying you, then just… ghost them. So take control – ditch and switch to Three.”
Three chief marketing officer Shadi Halliwell said: “We could all do with being a little more ‘Joan’ and not settling for anything less. And now is the time to take action – it’s never been easier to switch networks.”
Customers that want to switch networks can receive the PAC code through a single text message and can switch networks in just one working day.
As part of these changes Three has confirmed that it is offering new and upgrading customers six months half price line rental on its unlimited tariff until August 22 on a range of handsets, home, tablet and SIM only plans.