Samsung Galaxy S7 on O2 network
3GB of data
Unlimited calls and texts
Use voucher code TRS725OFF to get handset for £25 upfront instead of £50.
Available in black or silver. Silver link:http://www.mobiles.co.uk/samsung-galaxy-s7-silver.html?tid=WEBTMAUG16
I've seen deals this cheap but for just 1GB of data. 3GB is plenty if you're able to get WiFi easily when out of the house.