Things you should look into and check... 1 - signal strength at both the chromecast and iphone 2 - What and how are you casting to the Chromecast? Using a special app? A media player on your phone? Chrome on your phone? 3 - Is the phone, and chromecast on the same wifi network? 4 - Is the filetypes supported by your phone? Do they play fine on there? 5 - Is the app you using, possibly trying to direct stream to Chromecast? If so, is the file type properly supported, and at the right resolution for your Chromecast?
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