Sim carrier
What l have to do i get a iphone from my family they live in japan and now i put my dna sim card and it say that sim card not valid in our carrier location contact your service to open its i can use Wi-Fi but SIM card service not working.
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Please see my answers here regarding using a Japanese phone in Finland:
https://tuki.dna.fi/org/dna-en/d/the-sim-cards-usage-of-iphone7/
If the same issue doesn't occur with the same SIM card in a European phone, this might be the issue.