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Settings > about phone > which model do you have?
Does your network support LTE? which bands?
Make sure that you have a new SIM card and that your carrier/network has enabled this service in your account.
Hi @Weather070,
Welcome to the community.
Usually it will activate immediately when you enter your SIM card. If it does not however, go to Settings > More > Internet Settings.
You might also wish to call your network to make sure LTE is enabled on your account.