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When I boot android device having a SIM on roaming it took around 2-10 minutes to get cellular reception. I've tested this on multiple devices, similar behavior.

One interesting thing is, if device is already booted and then I inserted the SIM, it instantly gets cellular reception.

For a non-roaming SIM it works instantly even after boot.

Edit: The SIM provider told us it's an eSIM, though it looks like a regular SIM card.

If you've any explanation on this, could you please share?

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  • In your "already booted" tests did the phone had internet access through Wifi?
    – Robert
    Jun 8 at 12:30
  • @Robert No, there was no wifi
    – Al Mamun
    Jun 8 at 14:10

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