Phone doesn't work on some cities

On my home town my Samsung Galaxy S7 Edge works perfectly, but when I travel to some cities it presents the following problems

• No internet access. Neither WiFi nor 4G work.
• Overheating
• Battery discharges very quickly.
• In one case the keyboard was unresponsive.

In one city in a country it works fine, but in another city in the same country it doesn't.
Any ideas what could cause this strange behaviour?

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