With no information about what device you have or what carrier you are using it's hard to say.
You can check the phone settings and see if there is an option to update profile and prl. That can help.
Did you switch carriers when you got your new device? It's possible you just have poor coverage in your area.
You can also call your carrier's customer service and tell them the issues you are having. They may be able to reset something that will fix your lapse in service.
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