I manage to solve my problem with sending sms messages.. It just didn't work in any rom, firmware or stock .. (Message not sent ... failed) So I found the answer here: http://forum.xda-developers.com/show....php?t=1060826
"open up Messaging, hit menu, and choose Settings. Change the field for "Message centre" to your carrier's number."
And I could also say that the calling problem is kinda solved.. The right 4.3 modem on 4.3 works, but 4.3 modem on 4.4.2 works like 90%... When in 2G mode.. = liveable.