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I'm not sure I remember, but I think the issue might have been that both SIMs would be fighting for the same 3G radio?
Pairing with FreedomPop SIM should be possible (maybe, i think) with a dual-SIM phone that allows selection of 3G and or LTE for both SIMs-- 3G for voice/sms on FreeUp SIM, and LTE for data on FreedomPop SIM. Still might be difficult or impossible to limit data use to only the LTE SIM.......and I don't know what would happen with mms via the FreeUp #.
I was just getting ready to type this exact same thing.
The current crop of dual-standby phones will allow one SIM to use 3G and the other to use the LTE. The problem, before, was two-fold. For one-- the FreedomPop VOIP app would try to lord over the SIMs in both slots-- even if you wanted it to mind its own business and just control one SIM. A FreedomPop data-only SIM would solve that.
Also, when 2G was eliminated that only left two radios (3G and LTE) for the other two SIMs to share. If you ventured into an area that had no LTE signal you ended up with two SIMs fighting over one radio.
It's my understanding that dual SIM phones can handle this, now. I read how it's done but I've since forgotten. So a Truphone/FreeUP dual SIM setup should work.