First you should check if your phone is network locked.

Insert a different network SIM card.

If your phone shows messages "SIM network unlock PIN", it's network locked.

To buy a network unlock code you need the correct IMEI & model number.

With inserted an Unauthorized network SIM card, enter the unlock code provided from your supplier.

Video Instructions

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To reassemble your device, follow these instructions in reverse order.

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I have Huawei P20 and use IMEIUnlockSIM service to unlock my cell phone. The calculate me unlock code for 10 min. And use this video here to add my unlock code in my Huawei device. Now my phone work perfect on other sim cart. This video guide is very nice and helpful. I get the code from here:

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