I would like to remove modem-manager service from my boot, how can I do it ?
systemctl disable ModemManager.service
systemctl stop ModemManager.service
This worked to disable UML-295 modem from being managed by ModemManger which in turn enabled web-control via http://mbb.vzw.com on CentOS 7.
Check after disabling via:
systemctl list-dependencies multi-user.target | grep Modem
I found this had only a deleterious function when I tried the experimental version in Debian Sid and it failed to find my modem at all. That nearly doubled my speed and drops and failures became rare. I will probably remove it but for the time I want it to suspend function.
/etc/init.d I stored this file:
# NOMODEMMANAGER.sh DHM, Feb'19
# The ModemManager appears to slow down and interfere with the internet on my Dell laptop.