Question about BlackBerry KEYone

You can order it in India via Amazon India. I have also organised the device. It's not that difficult.

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Single SIM in Switzerland, although, this phone is from 2017 and I strongly advise you to get another brand since Blackberry is not selling any new product anymore. You would be better off with a dual sim Redmi or Poco or Xiaomi phone, they are sold everywhere, also in India.

No, it's a single SIM. (Dual SIM is only available in India).