ZTE MF288 Additif Au Guide D'utilisation page 18

Profile Name Type the profile name.
APN Type the APN string.
Authentication Password Authentication Protocol (PAP) provides a simple method
without encryption for the peer to establish its identity using a 2-way
handshake. Challenge-Handshake Authentication Protocol (CHAP) is
used to periodically verify the identity of the peer using a 3-way
handshake.
User name is used to obtain authentication from the ISP when the
User Name
connection is established.
Password Password is used to obtain authentication from the ISP when the
connection is established.
NOTES:
The Profile Name and APN are mandatory, others are optional.
If the Authentication is set to NONE, you don't need to set the User Name and Password.
14 Confidential and Proprietary Information of ZTE CORPORATION
ZTE MF288 User Guide