Virgin Media offer a similarly low-cost SIM-only plan to BT's new plans.
The deal includes 250 minutes, unlimited texts and 250MB of 3G data and is available on a 30-rolling contract for existing Virgin broadband, home phone or TV customers, or on a 12-month contract for those new to the provider.
Giff Gaff also offer a £5 one-month SIM contract.
The plan includes 60 UK Minutes – but with the promise of earning a free extra minute for every minute you get called – as well as 300 UK texts and 20MB of 3G data.
Talk Talk are currently offering a 12month SIM-only plan for just £3 .75 as part of a week-long half price sale.
The cheapest plan, which will revert to £7.50 on Tuesday March 31, includes 300 minutes, 250 texts and 250MB of 3G data.
Tesco Mobile's deals start from £10 per month and include 1000 minutes, 5000 texts and 500MB of 4G data.
Three's cheapest plan starts from £8-a-month for a 12month contract and includes 500 MB of 4G data, 200 minutes, unlimited texts and free calls to 0800/0808/0500 numbers.
Source : http://www.express.co.uk/life-style/science-technology/566272/BT-Mobile-Phone-Plans-4G-Deal-5-Three-Virgin-Media-Price-Comparison