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I have a Huawei Honor 8X running Android 9 and it is pretty new - probably a year or so old. I am currently running it dual-SIM - one for my telephone number and one for mobile data. I am doing this as my telephone contract is pretty cheap, and the data contract is genuinely unlimited 4G. All phone operations default to one SIM, all data operations default to the other.

I have noticed that my phone wifi hotspot stops working when I am on an inbound or outbound telephone call. This is becoming a bit frustrating as sometimes I need to access something on the web while speaking to someone. I have done a bit of research on the web, and found that some phones prioritise voice data over internet data, but that situation may be changing on newer phones (presumably as network bandwidths generally improve).

My situation is a bit different in that I expect I have two modems (one per SIM card) and so even if this restriction still applies to phones with one card, I hope I might be exempt because I am running two.

Of course my ideal situation would be to cancel the voice contract and use data/voice on one contract. However I am happy to maintain both in the phone if I can get if that is the only way it will work. If this is considered hard to do these days - even with a modern phone - I can transfer the data card to a dongle and carry that separately.

I am in the UK.

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    In a single SIM situation I would suggest to enable VoLTE. Without that your phone always has to stop 4G and fall back to 3G because LTE has no voice feature. Not sure how this works in a dual-SIM scenario. BTW: Are you sure your phone has two independent modems? Usually it is just ne modem/radio (time) shared between both SIM cards.
    – Robert
    Mar 8, 2020 at 17:28
  • Good thoughts @Robert, thank you. I am not sure I have two modems, no - it was an assumption based on the view that two SIMs sharing one modem has rather reduced utility. Maybe people use that just to operate two numbers, and tolerate data not working during a call.
    – halfer
    Mar 8, 2020 at 20:23

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Going by your problem I suspected that your device is Dual SIM Dual Standby, which was confirmed by GSM Arena.

What this means is that you can use only one SIM at a time be it for data or voice unlike Dual SIM Dual Active phones where you can use both SIMs simultaneously for voice /data. Also the user manual which can be downloaded from here does not mention Dual SIM Dual Active.

So, contrary to your expectations you have only one modem and hence the behavior you experience.

Only solution is to use one SIM that has both voice and data plans since your device supports VoLTE (see user manual). Be aware that if you use both SIMs on 4G/VoLTE, only one will work on 4G and the other on 2G

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    Thanks, I have the same problem on Redmi Note 8T, with one SIM for CALLS and one SIM for DATA. You helped me very much, and there is description of DUAL SIM too. GSMARENA
    – podpolanec
    Jun 5, 2020 at 13:21

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