I have a mx5 with 126.96.36.199 u and have problem with sim cards.
I have 2 cards in the phone but can only use one at the time. I can only use the one that I choose for data connection, the other one seems to close down, it’s just the chosen one that got “bars”.
I can’t find what to change.
Just back from holiday in the States and can confirm this too. Needed to have my Irish sim work along with my American Sim but only the Sim card with data selected would work the other just wouldn’t find a network. Lucky I had an old phone as back up as I was sure this wouldn’t work so just had to buy a nano adapter. This phone is turning into a total waste of money with the list of bugs piling up. Really want to love it but the software is handicapping it.
Probably it would be better, if you change the firmware to “A” or “I”.
I found the following information on the xiaomiforsale.com website:
- Both SIM1 and SIM2 support 4G networks. You can choose the data service mode in the Settings; one SIM will be 4G while the other SIM can only use GSM networks.
- Dual 4G can be achieved after users install firmware of universal versions."
I think I’m on to something.
I got my self yet another sim card.
1 and 2 is different company but uses same antennas and frequencies. 3 is another company using other antennas and frequencies.
1 and 2 can for that reason not work at the same time.
Combining 1/2 with 3 works better. When having data on 1/2, sim 3 is working to. But having data on 3, sim 1/2 is NOT working.
I think it must have something with the frequencies to do.