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is there some kind of application for the Internet without a sim?
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You need to transfer to esim. This is when the SIM card is recorded in the phone. So you can write several from different operators. Two esim (or mixed with a real one) can be active at the same time. Contact any branch of your operator. Some operators also have applications for calls via the Internet, instead of a cellular network. Thus, you can continue using your Russian number via Wi-Fi or the Internet from another SIM card without paying for roaming. At MTS, for example, this is My connection. The sound quality is better than through messengers. So you can buy a local SIM card in Tae, and use the app for calls to Russia.
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How is that? eSIM only if the phone supports.