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How does AOSP on a dual sim smartphone handle data? Does it provide the option to choose the SIM when I do tethering or use the native hotspot?

  • AFAIK tethering has nothing to do with how your device is connected to internet. Tethering works even if there is no mobile data or even if you have setup Wi-Fi as the source of internet. Access Point is created by hostapd while dnsmasq runs as dhcp and dns server. Rules to forward network traffic are defined using ketnel's routing table and netfilter. So the traffic flows through whatever connection of internet you have. But a ROM may add extra feature to choose SIM when tethering is turned on. – Irfan Latif Mar 19 at 12:17
  • This is mostly a question about UI, not architecture. Ideally, I could pick which sim I wanted to use for data. Does the UI afford any feature like this? – Evan Carroll Mar 26 at 2:54
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    Not in my knowledge, but neither too far from possibility. – Irfan Latif Mar 26 at 3:03
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According to digitalcitizenlife, you have two screens you can change this under the Default Mobile Data option,

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There is also a Huawei FAQ about this, "Dual SIM settings "

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