First you need to download the app "Host editor" to your ROOTED phone.
1. Remove completely your GMATE app from your device
2. Add the following lines on your host editor
127.0.0.1 c.skyroam.com.cn
127.0.0.1 m.skyroam.com
3. Install the Gmate app again
---------- Post added at 12:26 AM ---------- Previous post was at 12:23 AM ----------
You may have to look for the menu option to "save" the new lines you have added in the host editor otherwise they may not stay & you will think it hasn't worked so check for sure they have saved.