Flext 25 won't give you 200 minutes
and 200 texts. £25 a month gives you £40 worth of credit and with text messages at 10p each and calls at 20p per minute that'll give you 200 minutes
or 400 texts, but of course you can also mix and match.
That's on a 12 month plan though, so you won't be getting the £5 off per month. If you went on the same plan but an 18 month contract you get £60 worth of credit instead of £40.
You could get Web n Walk for £7.50 per month. It says that "fair usage" for this is 1GB per month and if you exceed that by a large margin every month T-mobile has the right to move you to a different plan or charge you extra, but to be honest I don't think they check the usage of every single customer to see if they exceed this quota
