WCDMA/LTE network not working in my mobile

I have consistent and good connectivity while I choose GSM mode in my mobile. It completely failed to connect while I change network to WCDMA/LTE.

please support

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Have you verified with T-Mobile that quality of the LTE service offered in your area. Additionally, if it is, I would verify with them that you have the optimal APN settings for the service level and quality if service offered in your area as well.

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