Some wireless devices may convert text messages (SMS) to picture messages (MMS) in certain cases, which can result in you paying the $0.75 pay-per-use Picture Messaging fee for each sent message. This only applies when you don't have unlimited messaging.

Do you get charged for MMS messages?

Chat apps like these use your phone's internet connection, so if you're on Wi-Fi it won't cost you anything. If you send an MMS when you're out about, the data you use will simply come out of your monthly allowance.

Why do I get charged for MMS messages?

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). ... your text has a non-standard smiley or symbol (such as an emoticon or emoji)