Which PTCL Modem provide on 4 Mb connection?

I am using 1 mb PTCL connection.my line is onu.if i do upgrade to 4mb. will ptcl provide me other my modem or i have to use my crrunt modem.i am using ZXDSL 831 modem which is working good since i got the ptcl internet connection.

your modem will reman same!!