I work all over the planet (currently Russia and in two weeks France) so have had duel sim phones for years as its often so much cheaper to pick up a local sim for local calls and stuff and keep my main number, especially here in Crimea as due to sanctions a UK sim wont work.
These phones have improved over the years and I now would not go back to a single sim. The current one I have is less half the price of an iPhone and does the same if not more and has a bigger memory as standard but if you choose you could replace one of the sims for a memory card.
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