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The Xiaomi Redmi Note 9S is a mid-range smartphone by Xiaomi released March 2020. It has a 6.67" IPS LCD display, a 48 MP main camera, a 5020 mAh battery, and runs on a Qualcomm SM7125 Snapdragon 720G.

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Why my signal bad?

Why my signal very bad, even i'm already change my sim card?

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Hi @deddyvanderberg

Is the phone in a protective case? If so try removing it from the case and check if the signal strength increases.

Also navigate to Tools > Security > Test Network and check what it shows regarding the network protocols and connection.

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Deddy Vanderberg crwdns2934231:0crwdne2934231:0
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