In your settings (not on mobile!) there’s a setting that allows you to KEEP your Titanosaur by letting it eat! Pretty cool if you ask me, it’s especially convenient if you’re on single player and you just want an EPIC mobile base!
Don’t try to use rpgs, they don't get it down fast enough and the titan turns around faster than the rpg moves across the sky. When i first tried to tame one it started getting the torpor up then ran into the water killing itself:(