Network Manager doesnt detect tty/ACM0 for Broadband Network

Hi all,
I have just installed Arch Linux and slowly getting acquainted to it. I have a mobile broadband connection via GPRS. Previously I was using Zenwalk OS and the Network Manager used to detect my device as soon as it was connected (provided the kernel module cdc_acm was enabled and 'dialout' group was added for that user).
I tried the same in Arch linux, but the Network manager though has options for connecting to Mobile Broadband, doesn't detect my device.
Somehow, I am using the Mobile broadband by using wvdial (had to do trial and error to fix it), but I am interested to know, why the Network Manager failed and hence think about fixing the issue.
Can anyone please guide me regarding this issue and help me out to sort the problem ?
Thanks in advance
With regards,
Ajay Kumar G

Welcome to the Arch forums!
Your post does a good job providing a very basic idea of what is going on, but unfortunately not much more than that. More information is required in order to properly diagnose this issue. You should check if there are error messages in the journal, or any other indications as to why things might be failing. Your computer typically makes an attempt at telling you what is going wrong.
From what you have posted though, it kind of sounds like you are trying to use two network management services at the same time. If you use wifi-menu, you are essentially using the ncurses front end to netctl. Netctl is basically just a collection of scripts that wrap the most basic networking tools. If this is in use, then networkmanager is bound to fail as you then have two services competing (and likely failing) to control that hardware.
Check to see if you have more than one service trying to handle things. You can run systemctl with no arguments to see everything that systemd wants to start. Though if you use systemctl --type=service then you can have it tell you only about services (as opposed to all unit types, like mount, automount, device, socket files and more).

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