Siemens CT66 / C66 / C65 / C71 / C70

Got the phone a few days ago.. Have it pretty much figured out however today the SMS memory got filled and I couldnt recieve any more messages. On ANY other phone that I have seen you can set it to auto delete the oldest message and/or auto archive them. Thus there is never a need to delete messages because of a full inbox. After an hour or so of futsing around with this phone and instruction manual I have found no way to do this on the Siemens CT66. It's very very annoying to have to keep your eye on the message memory to avoid missing messages. 👿