I’m also looking for alternatives to the Gemalto modules due to lack of support of my carriers frequencies.
Have you looked at some of the Sierra Wireless options? I’m not any sort of expert so some expert opinions would be appreciated.
That wouldn’t be an option for me, I’m in Australia, but it might be suitable for some other in the US.
Couldn’t tell from the information if it was suitable for voice calling. VoLTE is good to have though. That card appears to use an embedded SIM so I’m not sure if you could change providers.
I found this supplier of a large number of modems but they all say not suitable for voice calling. Maybe it can be a starting point to search for modem models.
I find this a good idea, I was thinking to open a similar post about the alternative modem module for Librem 5; I live in regional Australia and unfortunately none of the 2 modem modules are good for me, they lack the essential B28 LTE band. My wife has a phone that lack this band and it’s a nightmare, she’s always on 3G (a part when we are in some biggish town). So it would be great to find an alternative modem with voice/VoLTE support that is suitable for who like me lives outside the big cities in Australia.
I’ve come across this / these modems. More research is needed but digital voice and VoLTE are supported. The information is confusing as it refers to both eSim and (U)Sim.
The first module is Category 6 and claims “300Mbps downlink and 50Mbps uplink” which sounds pretty good for someone who might otherwise (PLS8) be trapped on 3G with no working LTE at all.
LTE A EG## = LGA
LTE A EM## = M.2
LTE A EP## = Mini PCIe
To start with with have possible hardware to give access to more bands and frequencies. If it isn’t already open source it is something we can work on.
We can’t change the hardware after it’s installed but we can update the firmware.
I couldn’t find anything on the EM16 either. I am going to contact Quectel Wireless Solutions regarding the status of their drivers and firmware. I will enquire about the EM16 as well.
If anyone has any other suggested questions to ask please reply and I will add them to my message.
I think there might be another pitfall to watch out. The dev board schematics locks to me much like the wwan m.2 port is wired via a usb 2.0 hub only. No pcie, no usb 3.0. If this holds true for the final phone watch out that the modems are usb 2.0 compatible and mind that this limits the bandwidth to 480mbit/s, so no need for high speed lte (like 2Gb/s down) modems to use.
Maybe some one from purism could provide some more information which modems they looked at an why certain ones weren’t chosen. I imagine a table to evaluate a the options internally by purism.
The EM06-A looks like a good option for my needs. USB interface, M.2 package, states 2 x SIM interfaces, supports voice and supports all the bands needed for my carrier.
you can manually set to use prefered 2G networks in the celular connection settings if you don’t want the phone to auto scan and use the higher ones. but 2g is pretty useless when it comes to internet data.