Some mobile phone operators are notoriously known for setting up utterly broken transparent proxies that you’re forced to pass through. This is a real annoyance that the WebSocket working group has had to deal with since the very beginning. The protocol is designed to ensure that it will fail very quickly in presence of such products so that your application can immediately fall back to other methods. If you find that it takes a long time to detect the anomaly and fall back, please report it to the hybi working group at the IETF so that the issue can be diagnosed and addressed.
In parallel, you can contact your mobile phone operator and ask them how you can access the net without passing through their broken transparent proxies or at least to know when they expect to get their broken proxies fixed to support HTTP according to specifications. Some of them might offer you multiple access options.