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Mobile network protocols

WAP and I-Mode are the two major protocols or standards used today. WAP is mostly used in the US, and I-Mode is popular in Japan and Europe.
Sites must often be designed separately for different protocols. The Adobe image tag does not need to be customized for each protocol.
WAP 1.0 WAP 1.0 is quickly losing popularity in the US. This required pages be built in WML, and had its own protocol.
WAP 2.0 Most phones are WAP 2.0 compliant, meaning they support XHTML MP (a mobile version of XHTML).
I-Mode
I-Mode supports CHTML (compact HTML) and does not download third-party images. First-party collection domain implementations should always be used with I-Mode sites so images are downloaded.