itwbennett writes "AT&T has said it is already seeing 'record traffic during peak hours of the night' with just the users selected for testing, and so it is 'very nervous' about the spike in traffic that it expects will occur after it launched MMS service for iPhones on Friday. Of course, setting records for MMS traffic isn't that great a feat considering that 'the service in question has been out for years on other handsets and hasn't exactly taken the mobile world by storm. In 2008, MMS made up just 2.5 percent of all messages sent from phones worldwide, meaning about 97.5 percent were SMS text messages, according to ABI Research. ABI expects the MMS share to grow to just 4.5 percent by 2014.' However, the carrier's fears in one respect may have been justified, says ABI analyst Dan Shey: 'Interoperability between carriers has always been an issue, and that's why MMS usage hasn't really taken off.'"