SCKL
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SCKL is a type of format used when sending image and ringtone data through Short Message Service (SMS) messages; most mobile phones can interpret this type of data, for some it will show the data as a text message. It was developed by Nokia.[1] Not all networks, for example CDMA, IDEN, and TDMA networks, can directly pass binary data to mobile phones. Ringtones and graphics contain binary data and Nokia's SCKL encoding provides a method of delivering binary data to a phone using only printable characters. Thus it allows ringtones and graphics to be delivered over CDMA, IDEN, and TDMA networks. It also requires a phone that can correctly interpret the SCKL format and most Nokia phones can do this, as well as some phones from other manufacturers and many WAP compatible phones.