PPP and IPv6 (with RM520N-GL)?

When I create a PDP context by setting at+cgdcont and dialing via atd*99#, after connection is established,
PPP frames are exchanged between modem and device controlling it.
In earlier days it was used for IPv4. Can it be still used completely for IPv6 (as long as device controlling the modem supports PPP with IPv6)?
My question refers to current PPP implementation of RM520N-GL.

Dear @capiman
Actually, the speed of PPP is lower, it is not recommended to use PPP.