Changing grand companies?

Can i know what happens, for example i know you can only equip that allocated GC's items, what happens to seals?

thanks.

the seals from your old gc is locked. you can't use the gc gear you left and must unequip any you have before switching.

Keep in mind that if you switch Grand Companies, you cannot switch to another for 30 days. Also only the first switch is free, every switch after that costs 50,000 Gil.