Why does a QR Code cut SMS to 64 characters max?
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I wanted to send my contacts and publish in my social networks a QR code with a ready tweet. I prepared a QR Code for SMS to 40404 with the following text "RT @schapsis #Foursquare A marketer’s perspective & best practices http://georillas.com/foursquare-a-marketer-perspective-and-best-practices/ #location based services #marketing #check-in #4sq" (see 2 QR code images bellow) The first QR code I made, generate an SMS that divides the above sentence in 3 SMS of max 64 characters each. The second QR Code I made generate an SMS that goes out in one sentence (same text) Try to scan and send the SMS - you will see the first one is divided in 3 (doesn't matter that you delete almost all the text and rewrite it will keep limiting the SMS to 64) Why the difference? When is a QR Code cut the SMS in msgs of 64 characters?
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Answer:
The problem is that the first QR contains unicode characters... specifically the apostrophe in "marketer’s" and the dash after "#Foursquare". This is a common problem when text is generated in a word processor, which often replaces standard ASCII code characters for - and ' with fancy long dashes and slanted apostrophes. These characters force your phone to send the entire SMS as a unicode message, which requires many more bits to send each character than a standard 7 bit SMS... which is why you see the maximum character count per message drop from 160 to 70, and the message then gets split into 3. It is such a prevalent problem that our SMS messaging platform and QR generator, and we provide the option to have our system automatically filter and replace those characters.
Amal Graafstra at Quora Visit the source
Other answers
QR has a limit to the number of characters that it can hold. To increase the capacity of the code you have to increase the size. If you are interested in exploring other 2D barcodes, you can look at Tag which can hold 1000 characters. The real value, though, is linking to a mobile website using the short code that comes standard with Tag. Short code services are also possible with QR, thought the end-to-end solution may be lacking. Nick Martin Online Community Manager Microsoft Tag
Nick Martin
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