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Hi, have you looked in your MYBT account to see what the charges are? Perhaps you are sending picture messaging instead of text messages?
All BT mobile plans include unlimited text messages, these are sms, if you send large messages or includes images they become mms, which are not included.
Check with the billing team to see what the charges are, you can also set yourself a spend cap, any where from £0.00, £2.50, £5.00 and upwards, this will prevent this happening in the future.
Lastly have a look at I'm being charged for texts when I thought they were included in my plan :
Sometimes you might get charged for a text message even though most texts are included free in your plan or you have plenty of allowance left. This is often because your phone has converted your text (SMS) to a picture message (MMS). Picture messages aren't included in your plan.
Typically, phones will convert text messages into picture messages when:
On some phones you can clearly see when this happens - for example, you might see a character count changing to a file size.
Some phones let you switch this function off, or enable you to set up an alert when it happens. You'll need to check the manual or go to the support website for your phone to see to do.