Existing Maxx users are given a one time 1 GB data for roaming in Malaysia (Celcom) or Bangldesh (Robi Axiata). 

May be an image of text that says "< M1Maxx M1 Maxx Today 12:08AM M1: Roaming is now available on Maxx! Το thank you for your support, a one-time free 1GB Roaming Data (valid 30 days) for use in Malaysia (Celcom) and Bangladesh (Robi Axiata) has been credited. Login to M1 Maxx App (http://onelink.to/wrke3a) to check your balance."
Roaming Data and Preferred Network
Maxx customers can use Roaming Data on the following foreign Preferred Networks
a. Malaysia – Celcom
b. Indonesia – XL Axiata / Indosat
c. Bangladesh – Robi Axiata

Customers must enable data roaming and connect to the Preferred Network on their mobile devices before using the Roaming Data service.

Data Roaming services will not be available if the phone is not connected to the Preferred Network or once Roaming Data is fully used.

When roaming, Prepaid SIM can only be used in countries where the foreign network operators support such roaming service. M1 is unable to guarantee the functions, including roaming, quality, charges and technical infrastructure of the foreign network operators.