Texts and picture messages
You might be charged for a picture message (MMS) when you thought you’d sent a text (SMS). This could be because your text has turned into a picture message.A text might turn into a picture message because:
To stop this happening, keep messages within the character limit. Remove pictures, sounds and smileys from your messages. Sometimes your phone will convert a text to an MMS when you send a group message so try sending the message individually or to smaller groups.
Older phones like the Samsung Galaxy S1, S2, S3, S4 and the Galaxy Note 1, 2, 3 and the Galaxy Ace will change a text into a picture message if it includes certain smileys or symbols. If you’ve got one of these devices, you can switch the function off. Go to Messaging > Settings > Text Messages > Input mode > choose Unicode instead of Automatic.
If you’re having this issue with a different device, take a look at the manual. You might need to contact the manufacturer to find out how to switch the function off.
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