Thanks to its MMC card or some other feature,( every Siemens centre gives me a different reason), the SL45 also crashes nearly every time you send an SMS, or sometimes, if you are particularly lucky, while you're answering a phone call. Trying to convince someone that your super expensive mobile phone crashed and you did not try to reject the person's call is quite a difficult task at times. It is also difficult to explain the reason behind your delay of about 2 hours to answer a message, since you put your phone down after sending a message, and it crashes, so you do not receive the reply until you notice your mobile had hung
Apart from that problem, it is a really great phone to own, just as long as you have tolerant friends, or you get an SL45 with updated software