Public Mobile Internet and MMS APN Settings for Sony Xperia XZ1

Go to Settings Connections Mobile networks Access Point Names

Add a new APN by pressing ADD on right top corner. If device has already set values for Public Mobile for any fields below leave them. Change others as below.

Name: Public Mobile
APN: sp.mb.com
Proxy:
Port:
Username:
Password:
Server:
MMSC: http://aliasredirect.net/proxy/mb/mmsc
MMS proxy: 74.49.0.18
MMS port: 80
MCC: 302
MNC: 220
Authentication type:
APN type:
APN protocol: IPv4
APN roaming protocol: IPv4
Bearer: Unspecified
APN PPP phone number: Not set