Mobile data? Android offline issues.

My game works perfectly on Android for posting new scores and showing the in-game leaderboard when connected to wifi. However, I noticed if am on 3G or 4G mobile data instead, it doesn't work. Is there a way to connect to the server using mobile data too? Second, if you are offline, I'd still like to play my game regardless (as it's single player) and merely bypass the leaderboard functions temporarily, but how do I go about this? I've tried using the gm code "if os_is_network_connected()" to check the network before running any game server scripts (works on my pc) but android considers 'mobile data' as a network too and therefore breaks through this and shows fatal errors. Do you have a solution for this? Thank you!