can block 4g phones ?it seens to answer "yes" on the site... is that true ?
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Looks like you partially can by this thread:
https://www.scirra.com/forum/detect-phone-type-cocoonjs_t83268
From the manual:
Is on platform
Test if currently running on a given platform, such as Android or as a Windows 8 app. Note it's possible multiple options can be true simultaneously. For example, if running in a browser on Android, both Is on platform Android and Is on platform HTML5 website will be true.