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unable to connect to cellular

i have a iphone 12 mini that can not connect to cellular, when i took the motherboard out and put it in another iphone 12 mini casing, it can get cellular.

what do i need to replace in the original case to get cellular working? thanks.

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olha, provavelmente tem alguma antena fora do lugar ou em lugar errado, eu perticulamente nunca vi nada do tipo

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A que antena você está se referindo? Certamente não é à antena conectada à placa‑mãe

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