BT has re-entered the consumer mobile phone market with the launch of BT Mobile.
The SIM-only 4G network is based on EE spectrum following an MNVO agreement between the two operators.
Anyone can sign up to BT Mobile, but existing BT Broadband customers will receive the best deals, with the cheapest tariff starting at just £5 a month.
New subscribers can enter contracts ranging between £10 and £25 per month, with broadband customers receiving a monthly discount of £5.
The top-end bundle nets users unlimited talktime and texts, plus 20GB of 4G data, and up to five members of a BT household are eligible for the discount.
All customers will receive free access to the BT Sports channels through a smartphone app, as well as unlimited use of BT WiFi hotspots nationwide.
The launch of BT Mobile sees the operator become a quad-play service provider, offering package deals that combine TV, landline, mobile and broadband.
"Customers can build their own bundle to suit themselves, simply by adding a BT line, broadband, TV and Mobile together," Kelly Barlow, BT's director of voice and mobile.
"Our current best deal for superfast BT Infinity is £7.75 a month, and TV Starter and BT Mobile can be added at any time for as little as £5 a month.
"That way, customers don't need to wait until all their contracts for line, broadband [and] TV align in order to add mobile. So, you can bundle Infinity super-fast broadband, TV and BT Mobile for £12.75 plus standard line rental."
Meanwhile, BT's £12.5bn acquisition of MNVO partner EE is expected to receive the green light from regulators before the end of the year.
