I am a Canadian using Freedom Mobile. I would like to use variant PLS8-X for librem 5 as it supports LTE bands 13,17,5,4, and 2. Freedom Mobile supports bands 4, and 7, and will be/already supports band 13. Will it be possible to choose the variant for the modem for a librem 5 phone?
The Librem 5 will actually have an m.2 slot for baseband (how cool is that!), so being able to open it up, and swap out the modem, allows for all sorts of additional use cases beyond the core functionality. It also allows us to get pre-certified modems for the regions, so a dual benefit!
PLS8-US: LTE ( 17,5,4,2); 3G (5,4,2); 2G Quad Band
PLS8-X: LTE (13,17,5,4,2); 3G (5,4,2); 2G Quad Band
So, the difference is only one band. Also, if I understand correctly, SMS could still go via 3G or 2G, either in parallel, or by restricting to 3G.
Nevertheless, would of course be nice to provide PLS8-X on request. @Richard, I didnât notice that variant before, as it is only mentioned in the data sheet, not the website. Maybe this variant was added after the decision was made?
So, the difference is only one band. Also, if I understand correctly, SMS could still go via 3G or 2G, either in parallel, or by restricting to 3G.
Rogers is the only Canadian carrier that has a 2G network since they were GSM based from the beginning. All other Canadian carriers were CDMA, transitioned to HSPA+ AND did not requiring their new â4Gâ phones to have a CDMA fallback, unlike Verizon. They went from CDMA right to LTE thus needing CDMA for voice calls until they got VoLTE.
@Richard, I didnât notice that variant before, as it is only mentioned in the data sheet, not the website. Maybe this variant was added after the decision was made?
That I couldnât say but I donât know of any major GSM based carriers use that band. Freedom Moble (previously Wind) does not use Band 13, they use Band 66 for LTE and if I remember correctly theyâre the first carrier in the world to use it. Itâs also listed as AWS-3.
SMS should be going (end-to-end encrypted) via the internet, where there is some hope of privacy and security.
Unfortunately thatâs not how SMS works. Unless theyâve got VoLTE, SMS goes through carriers Voice cores and not their Data Core. To encrypt SMS both parties generally need a special app and at that point you might as well just use⌠Librem Chat!
While my comment was not to be taken too seriously, I would point out that on the iPhone the SMS client makes the decision as to whether to send an SMS via Apple (iMessage) or via the carrierâs SMS service. (The colour of the resulting SMS tells you how the message ending up getting transmitted.) While I am not privy to Appleâs implementation that decision appears to be based on whether both sender and receiver have consented to participate in that (via Settings) and whether both sender and receiver currently have internet (data) connection and more significantly, I would suggest, whether both sender and receiver are using iDevices.
As Apple is âclosedâ we have no guarantee about the security properties of that service and whether it is better or worse than the carrierâs SMS service, and in what ways.
A similar idea would appear to make even more sense for the librem 5 - but for V1.1, as I dare say that you/they have enough on the plate at the moment.
Do you know if it will be possible to have a modem that support the LTE band B28 on the Librem 5?
I live in country Australia, and that specific band is fundamental for any mobile phone here.
By which you mean: in the backwoods / backcountry of Australia?
An area remote from any cities and presumably needing coverage on a lower frequency band?
âIâm not an expert butâŚâ I think that means that you wonât be able to get LTE at all on the PLS8-E, and the PLS8-US would only be marginally better. (Is that something that you have checked?)
Maybe someone from Purism needs to comment on the strategy for international / non-US customers.
It doesnât mean that I live in the outback, or the desert: outside the big cities (Melbourne, Sydney, Brisbane, etc.) and the small country town (letâs say 20k people?) the main frequency used is B28 - > 700MHz. Without that you are really disadvantaged, because most of the time you probably end on 3G⌠Even if you live in a city and move often outside, you can have big problems without that bloody band
The simplest answer is, this is our first phone, please bear with us. Weâre working on some amazing things but itâs hard to do it all at once
More to the point though is we have to have a baseband (cellular chip that talks to the cell network) that we can seperate from the CPU. This is to allow for a killswitch and that the baseband does not have Direct memory access (DMA). See Kyleâs post about killswitches on the Librem 5 and Nicoleâs post about our choice in using a seperated baseband.
Fair enough. Letâs see if you can do with a modem that is OK for our poor bastards down under that donât live in a big city, otherwise itâs fine, Iâll step back to my purchase and will support the project in a different way.
Wasnât hassling you to have solved this problem. Was hassling you to communicate your strategy.
For example, it looks as if there is a genuine problem with that geographical location.
Strategy could be
a) delay delivery a bit more for that location, or
b) ship âas isâ and send out a replacement module later on, either at your cost or at reasonable cost to the customer - assuming that a replacement baseband module could reasonably be installed by the customer, or
c) bad luck for customer, or
d) withdraw from sale in that location (refunding customers), or
Our strategy is to develop and release âthe Worldâs First Encrypted, Open Smartphone Ecosystem Giving Users Complete Device Controlâ.
With freedom you need knowledge. We are giving folks full knowledge about what to expect before they purchase the Librem 5. Not only do we say what bands will be supported, we even release the exact model of basebands weâll be using, hence allowing this discussion in the first place.
If the phone wonât work in your area, we are sorry that is the case and you do with that info what you will. Remember though that the baseband is connected via an M.2 slot so if youâre able to find one that works in your region, you are free to use it. If you arenât able to find one then maybe we arenât either unfortunately.
And I want to re-iterate, this is our first phone. The original iPhone didnât even get released in Canada and its Americaâs hat! (More correctly theyâre our pants but that is a discussion for another timeâŚ)
But since no one seems to have clicked the link above to Nicoleâs post about choosing a baseband, I will quote it below:
[We have started] investigating and testing a different modem, in order to evaluate its potential alongside the Gemalto PLS8 one.
Hopefully in the end they offer another modem that fixes some or all of our concerns in here (specific to this thread, UMTS B4 (1700/2100 AWS) and LTE Band 13 and 28)
