Why was your message broken?

I like send messages rather than dialing to communicate wtih my cellphone. As using so far, I have a big problem in my mind, that, why was messages broken when it was enough long to send? I had asked my service provider CHT, the service-person told me that caused by my OLD-SYLTE-PHONE, it is never happen with newer phone. I did not believe that anyhow. Until today morning, I have read a article on OSNEW.com, Why Text Messages Are Limited to 160 Characters, that pushes me to find something more out.

My Nokia 1650 cellphone supports SMS, EMS and Instant Messaging, spec page said that supports length up to 250 characters, not as long as wikipedia SMS page said, 160 characters.

I have not yet find anything solves it problem to normal message.