point to point protocol PPP portable document format PDF portable network graphics PNG post office control POP Quick response QR random access memory RAM RAW RAW read only memory ROM short message service SMS simple mail transfer protocol SMTP small computer system interface SCSI standard generalised markup language SGML subscriber identity module sim tagged image file format TIFF transmission control protocol TCP transmission control protocol / Internet protocol TCP/IP uniform resource locator URL universal mobile telecommunications system UMTS universal serial bus USB virtual private network VPN Web WWW, W3 what you see is what you get WYSIWYG wireless application protocol WAP World Wide Web   World Wide Web Consortium W3C