Using with Ting

First, make sure the SIM card is activated with ting
Then, find the USB tty device. its usually the 3rd device created after plugging it in. so if you didn't have any ttyUSB* devices, it would be ttyS3 (starts at 1)

sudo screen /dev/ttyUSB3 115200

ati5

at+cgdcont=1,"IP","wholesale"

That should do it. If you have a network manager running, you should use it to configure the device. Otherwise:

Other useful commands:

at+cfun=1

at+cfun=0

To manual connect: at!scact=1,<profile>. e.g:

at!scact=1,1

To manual disconnect: at!scact=0,<profile>. e.g.:

at!scact=0,1

Using with pfSense

To use this device with pfSense:

Login to pfsense web portal and go to Interfaces -> PPPs
Click Add and use the following:
- Link Type: PPP
- Link Interfaces: /dev/cuaU0.3 (adjust if you have other USB tty devices)
The rest will depend on your provider, but for Ting I use:
- Country: United States
- Provider: T-Mobile
- Plan: LTS - fast.t-mobile.com
- Username/Password: leave empty
- Phone number: *99#
- APN: wholesale
- The rest: defaults
Click Save
Go to Interfaces -> Assign
For Available network ports, choose "PPP0(cuaU0.3)" and click Add
It named mine OPT1
Click OPT1 to edit it and then use:
- Enable: [x] (checked)
- Description: WWAN
- IPv4 Configuration Type: DHCP
- IPv6 Configuration Type: DHCP6 (doesn't seem to support IPv6)
Click Save

To set up as a failover internet access:

Go to System -> Routing -> Gateway Groups
Click Add and use the following:
Group Name: INTERNET
Gateway Priority:
- [WWAN_DHCP] [Tier 2] [Interface Address] [Interface WWAN_DHCP Gateway]
- [WAN_DHCP] [Tier 1] [Interface Address] [Interface WWAN_DHCP Gateway]
- Trigger Level: Member down
- The rest: defaults
Click Save
Go to System -> Routing -> Gateways and click on WWAN to edit
Change the monitor IP to something different since the default won't work (I use 8.8.8.8)
Click Save

You can now test the failover functionality by unplugging your WAN connection and see if your internet access works

Cheers,
Jeremy ;-)