In the smartphone era a bland text message is a thing of the past. We love to pack our smartphone messages with cute pictures and colourful emojis to express how we are feeling and show friends and family what we are doing. We also love to include photos in our messages but adding smiley faces and pictures in your text messages may be costing you much more than you realise. Do you know the difference between an SMS and an MMS? Read our smartphone user guide to learn the difference between a free text message and an expensive MMS message.