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I have unlocked a Huawei R218H MiFi with the unlocking code provided by Vodafone and it accepted it. Unfortunately the new SPs SIM does not working in the device. The SP confirms that it should be working OK. The SIM works OK in other devices and the other working SIMs don't work in this device.
I can only direct you to the Vodafone site for the device support but it should be the same procedure for your other provider with the different APN settings. I would image you would need to select connection network and enter the settings.