How do i prevent/stop SFOS from using data from particular SIM?

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OS 5.0.0.67, Redmi community port.
Internet is set to use SIM 1.

Roaming is disabled on SIM 2.
Network Mode - not set for SIM 2.

I have data+calls SIM 1 and second roaming SIM without any data bundle(2G ?). SFOS keep on sending 149bytes of GPRS data over second SIM every few hours, which cost me dearly.

How do i prevent/stop SFOS from sending GPRS data over this SIM ?.

On android, we have the option to set mobile data, calls and SMS for specific SIM slots.

Thanks,

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2

Iā€™m pretty sure this is possible by going through
Settings => Mobile Network and
Settings => SIM Cards

I currently have only 1 SIM in a 2 SIM phone, but afaics you can

  • tell it which SIM to use for mobile data
  • disallow/disable all sorts of things for the other SIM, up to the point of disabling automatic network selection and choosing an invalid network maybe?
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