O2 has unveiled an MMS service that allows its customers to post pictures to micro-blogging service Twitter straight from their mobile phone.

To start using Twitter MMS on O2, mobile phone owners simply need to log-in to the micro-blogging service and link their mobile phone number to their profile. Then they can compose an MMS featuring the image and send it to 86444.

O2 said if the mobile phone owner pays for MMS bundles, the multimedia message will be deducted from this, otherwise they will be charged the standard rate.

Sally Cowdry, Marketing & Consumer Director at O2 said, "We know how much our customers love using Twitter via their mobiles and this service will make it that much easier to capture those special experiences and instantly share them with their followers."