est-ce que tu utilises des lettres spéciales dans ton SMS?
c'est possible que certains charactères sont interprétés comme 2.
Lis vois ça:
http://forums.webosnation.com/palm-os-devices/30856-sms-double-characters.html
"...The GSM alphabet is a 7bit one. This means it supports 127 chars (a-z, A-Z, 0-9,
commas, semi-commas, colons, @, and a few more). Non-regular characters, like a
cedilled c (ç), accentuated chars, or different charsets (cyrillic, chinese,
helenic...) are composed of 2 or more regular chars. My guess is you're using
greek characters, so each letter counts as 2 characters. A...."