Number of slots must be many. Main purpose is to store whatsapp sms and that's it.

Cheap price.

Cheapest cost per sim.

Being able to run multiple whatsapp account is a plus. So something like secure folder feature in Samsung

  • If you want multiple whatsapp accounts, you need multiple phones AFAIK
    – Irsu85
    Oct 1 at 13:50

The Gigaset GS190 32GB Grey is €100 and has dual sim, about as cheap as you can go with dual sim. There are cheaper options, but I don't know if those can run whatsapp.

  • I got something cheaper but your answer suggests that dual sim is most cost effective
    – user4951
    Oct 3 at 16:57

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