When do you unlock mounts?

[Laduca]

What is the level requirements? I just got the CE upgrade and got the Coeurl mount.

[Spawnie]

What is the level requirements? I just got the CE upgrade and got the Coeurl mount.

pretty sure grand companies unlocks after ifrit dungeon u have a few quests to do after that then choose ur grand company n u get quest for the choco :3

[Arriverderci]

I don't recall seeing a quest to join a Grand Company where/how can i get this and is there a level requiment.

You're about there. At level 20, you will be doing the "Bowls of Ember." That be Ifrit.
After that, you will be talking the 7Scion's and then do shit and then you may pick your GC!
They will be standing next to Minfilia. You basically need to keep truckin' the main storyline.

[ChickensEvil]

The thing to remember about this game is EVERYTHING is unlocked through a quest. If you don't have access to something either you need to move your main story quest forward or you need to move your class quest forward. But the quest level for certain things I can remember off the top of my head are as follows:

LvL 10: Able to pick up crafting and alternative classes (through class quest) - Chocobo Porter Unlock (through main story) - Duty Finder/Guildquests/Levequests (through their respective quests, e.g. in Horizon if questing near Ul'dah)
Lvl 15: Regular dungeons (required to be completed to move the story forward) - Class special ability unlock (class quest) - airship travel (main story)
Lvl 20: Mount unlock (through main story/quest), Pick your grand Company (through main story)
Lvl 25: Ability to create a Free Company
Lvl 30: Able to select a Job (Black Mage, Scholar, Warrior, etc) (Through class quest, has other requirements)

There are a bunch of little things that also unlock as you go through the earlier levels like Recommended List (shows nearby quests, hunting log etc), inns, your hunting log, minions. I don't remember the exact levels for these things but they unlock as you go.