Has anyone used a multi carrier sim?

[SethG]

Like the topic says. There are a few vendors in the OT space that offer sim cards that offer service on the big 3 (Verizon, ATT, Tmobile) and supposedly switch automatically to the fastest / best network offering redundancy to the connection. If so how has it worked for you? can you tell when its switching? (ie is there a delay) does the switching between providers actually work in the MG / MR-c devices? 

[PhilipDAth]

I don't see how a SIM can automatically switch to the fastest network.  It is just an authentication device.  I guess they can run Java, but those capabilities are pretty limited.

When it switches networks, your public IP address must change.  That would break any TCP connections and require them to be rebuilt.

[SethG]

That is why I am asking, it doesn't seem possible. My boss went to a conference and saw these and wanted me to look into it. All I have seen is the propaganda (so to speak) and wanted to see if anyone had real world experience.

This is the explanation on one of the websites selling them:

https://flolive.net/blog/glossary/multi-carrier-sim-card/

[rhbirkelund]

If these are what I think they are, it's merely a SIM card with a Subscriber that has roaming agreements with different ISPs, targeting the IoT segment. So say you have a SIM card for 3 DK ISP in Denmark, they may have a roaming agreement with Telia, who may be present in other countries. And then you can either configure your device to use the Best Operator, or force it to use a specific Operator.

[CloudStrife]

Multi-carrier SIM cards, designed to switch between networks like Verizon, AT&T, and T-Mobile, aim to provide a more reliable connection by automatically selecting the strongest signal.  These SIMs are often used to provide redundancy and ensure connectivity in various environments.  While the concept is appealing, the actual performance can vary.  The switching process itself may introduce a delay, although the duration of this delay is not specified in the provided sources.  The effectiveness of this switching mechanism in specific devices, such as MG/MR-c devices, is also not explicitly addressed in the provided content.  However, the Net10 SIM card kit is compatible with multiple carriers, including AT&T, T-Mobile, and Verizon, which is a good option for those looking for a multi-carrier SIM card.

[SethG]

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