Following our update of the Apple iPhone 1.1.3 update which has been causing major problems (See Here) it seems that Apple have an answer. Yes we know that the iPhone 1.1.3 update was causing major problems with SMS message order but now there is an answer.
Apple have just put up on their site a quick fix solution, the new support is a relatively simple fix turning on automatic date and time updates.
The problem was apparently caused when the internal clock does not match up to the carrier clock, which basically means it will continue to annoy you frequent travelers, so lets hope the Apple fix sorts out the problem and that there is a better solution in the works.
Source - Apple
