Phoned tmobile to see if I could have another &.50 sim only deal as above, which was on 3 weeks ago, they said they've stopped doing them.
But offered the above for £17.92 on a 24 month contract, choice of a few phones, I chose Samsung Galaxy
Apparently from 1st Feb there internet goes down to 500mb per month
most phones are worth about £150
take away this cost, the deal comes out at about £11 a month