There's actually a reason for the 160 character limit when sending SMS.
Quote:
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SMS was designed to deliver short bursts of data such as numerical pages. To avoid overloading the system with more than the standard forward-and-response operation, the inventors of SMS agreed on a 160-character maximum message size.
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It's not a convenience issue at all, it's a matter of system overhead. 160 characters fits inside of the check packet that phones/towers use to communicate.
(Reference
http://communication.howstuffworks.com/sms.htm )