Currently, you can only send texts (SMS and MMS) to normal UK mobile numbers with all 3 SMARTY plans, so text messages are free no matter which plan you're on.
However, at some point you'll also be able to send other kinds of messages which will be chargeable. Chargeable texts will include premium-rate texts and short-codes, which are used for entering competitions, buying ringtones, voting on reality TV shows and paying for parking.
We'll let you know when you're able to send these alternative types of text messages.
When the time comes, please note that you'll need to buy one of our cash add-ons in order to send a chargeable text. You'll also need a cash add-on to text internationally from the UK - there's more information here.