PPTP currently is working for US(pptp.bolehvpn.net) and UK(ukpptp.bolehvpn.net) servers only.
Android however depends very much on your version of android. Anything below 2.3.6 will not work. 2.3.6 will probably work and 2.3.7 and above including 3 and 4 will definitely work.
Iphone and Ipad will work on both wifi and 3G.
Maxis/Digi 3G WILL NOT WORK
Celcom 3G maybe
UMOBILE 3G will work
We probably won't be switching back to L2TP