I discovered strange behaviour while sending a sms using MPE. If I use some accent e.g. a caret (^), the number of remaining characters reduces more than just one (in this example 90 chars). This means that some sms-messages will be devided into two messages where the actual number of characters is below 160. Is this a known problem?
It's not a problem, it's a normal behaviour. Notice, that the text coding is changing from Standard to UCS2. It's because you are using special characters (national letters) and they need different text coding, so the whole message have smaller amount of characters.
The same situation you can see on your phone itself, if you enable this option (national letters) while typing a new message.
In MPE the change is automatic.
In your phone (while typing a message) press "More" and search for option "National chars." Everything is written in User Manual of your phone.