Sim Card Slot

[christensen.g]

Discovered the sim card slot under the battery and was wondering if anyone had tried putting their cell phone sim card in?

[Saiboogu]

A few posts mention trying it with no luck. The hardware supports GSM but as far as we can tell the software doesn't. Hopefully Google will activate it soon.

Come to think of it.. you can interact with the modem directly via crosh (Ctrl-Alt-T) - maybe you can turn on a GSM SIM that way. I've got some time off for the holidays, maybe I'll play with it.

[picklejw]

I've tried messing with that command. I have no idea what I would type in and stuff, maybe someone else knows what they are doing...

[matlobi]

I inserted my T-Mobile SIM the same day I got my Cr-48, and there was no response from the device.

As has been said, the hardware is there, but the software is not. I haven't done any poking around in crosh either.

[gr8mick1]

I tried this with a verizon Sim card and didnt see any noticeable changes

[woodyman]

sim cards do work now but you need to be in dev mode and type in some terminal commands...

via Hexxeh's Blog - Home of…um, well, Hexxeh…

Since some people seem to want to run their Cr-48 on AT&T and so on, I figured I should share. Turns out, it’s really easy to enable. You need to be in developer mode, but that’s pretty much the only requirement. As usual, you do this totally at your own risk and I’m not responsible for anything that might go wrong. Basically, the standard disclaimer crap. With that said, here’s the howto:
Pop your SIM card into the slot under the battery (must be a full-size SIM, microSIMs you’ll just lose in there, fine if you use an adaptor though)
Make sure you’ve enabled developer mode – do this by flipping the switch under your battery
Once you’re booted into developer mode and logged in, press Control-Alt-T
This opens crosh, a limited command shell. Since we’re in developer mode, we can get a full shell. Type the word shell and press enter.
You’ll get a shell that starts with ‘chronos@localhost / $’. Once you’ve got this, we can type in the command that flips over to GSM.
Type the following command: modem_set_carrier “Generic UMTS”
Wait a couple of minutes, then you can exit the shell by typing exit twice.
Your 3G should be usable assuming you have an active service plan on that SIM card, and that ChromeOS knows your APN settings.
This is all totally unfinished right now, I just saw that the changes had shipped in a recent update and decided to see if they worked, turns out they do. However, there are a few drawbacks:
Your APN details have to be part of a hardcoded list list in flimflam, you can see this list here.
Your carrier name won’t appear in the UI, nor will any usage details. Don’t complain if you run up a huge bill, same deal here as tethering when it comes to data usage.
It’s totally experimental, so it might break totally unexpectedly.
If you’d like to switch back to Verizon Wireless, do the above again but instead of “Generic UMTS” use “Verizon Wireless”. There are a few more options here that you can try, but I don’t know if they work. Feel free to give them a shot. “AT&T”, “T-Mobile” and “Vodafone” are also valid options.

[woodyman]

so to sum that up...

developer mode

crtl + alt + t

type shell

modem_set_carrier “Generic UMTS”

wait 2 minutes

type exit twice