Mobile data not working, randomly.

The mobile data doesn't work in certaing places of my city. Unfortunely .. like my home. I have Wi-Fi so no problem, but it's really annoying. I have Android 5.1, Ulefone Paris.
When I turn data on nothing happens. When it's working there is 3G or 4G next to the signal icon in status bar. But it doesn't show anything. Idk if it's related to the cell towers but if anyone heard of this before please let me know. Thanks

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