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Use of 4G and 5G SIM Cards in UCM/4G
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 Posted: Saturday Nov 18th, 2023 03:59 am
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slychiu
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The UCM/4G works on 4G (or LTE) networks. It is not able to work in 5G -only networks, but 5G SIM cards can normally work on 4G Phones.
However, UCM/4G makes use of 3G for Voice calls - it does not support VoLTE (Voice Over LTE).

Check the mobile settings on the phone to ensure that LTE or 4G is selected, NOT 5G. for exampkle for Samsung phones, go to Settings > Mobile Networks > Network Mode.
select LTE/3G/2G (autoconnect) or 4G/3G/2G, as LTE is the same as 4G.
Do NOT select 5G

(ignore the Data Roaming button, it does not affect the network setting)



If the SIM card uses VoLTE for voice calls then Voice calls will NOT work on UCM/4G. 
To fix this, disable VoLTE on the SIM Card. On a Samsung Phone, go to Settings > Mobile Networks > VoLTE Calls, and Unselect this feature.  Note that some phones do not show this setting.
Note that the new UCM/GSMA7608 module supports VoLTE


Also if the SIM Card is 5G, Disable "Use 5G Standalone Networks", and select Network Mode = LTE/3G/2G (auto connect).

Remove the SIM Card from the phone and insert into the UCM/4G. The UCM/4G should now  be able to dial out by voice calls

Last edited on Sunday Sep 22nd, 2024 02:16 am by slychiu



 Posted: Tuesday Jan 9th, 2024 05:45 pm
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Ian
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I had a look at Laser systems web and it the module appears to be 3G Will it work with 4G?
Comfort GSM Module version 4 (3G)



 Posted: Wednesday Jan 10th, 2024 01:27 am
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slychiu
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Laser should have UCM/4G. I believe they may not have updated their product list. I suggest that you check with them



 Posted: Wednesday Jan 10th, 2024 10:09 am
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Ian
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slychiu wrote: Laser should have UCM/4G. I believe they may not have updated their product list. I suggest that you check with them
Thank you.



 Posted: Thursday Jan 11th, 2024 03:42 pm
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mikegriff
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Is it possible just to buy the piggy back board which holds the sim?
Mike



 Posted: Friday Jan 12th, 2024 01:23 am
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slychiu
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Yes there is a part number GSM/4G. But the ucm/gsm base board should have firmware version 7. You will need to upgrade to the laest firmware which will work for 3G and 4G



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