concatenation = true

Follow-up to my last post regarding concatenation of sms messages: It
appears that despite my earlier suspicions, this works fine for logos
and ringtones, but not for text. If I send text data and set
concatenation = true, the phone (nokia 6210 for that matter) gets
garbage. I've looked at a dump of the PDUs, and they look ok. That is,
the hexdump shows the UDH is ok, and the text is all there (as 8-bit
data corresponding to each char).

 Any ideas? 

P.