T-Mobile price plans come with Flexible Boosters. Choose to keep the Unlimited Texts Booster (as advertised), or swap it for the Internet, Unlimited On-net (for calls to T-Mobile phones) or Unlimited UK Landline Booster. You can switch between these options every 30 days for total flexibility.
If you want more from your plan, a range of additional Boosters can be added for £5 a month each, and changed or cancelled with 30 days notice. Choose what suits you.