So mobile networks work on multiple redundancies:
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A standard mobile network will have one more BTS, the BTS has its own UPS and back up generator, as an added redundancy, the BTS can go into "MESH" networking mode essentially becoming a repeater for nearby cell tower thus providing you with the best possible signal/reception:
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The Cell tower is just an access point, the main leg work is done by what was known in the old world as a "telephone exchange" in modern parlance it is referred to as a BSC & MSC: Base Switching Centre and Main Switching Centre:
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Even if the WiMAX, LTE, WAP is unsustainable, the MSC will conserve bandwidth and revert to GSM mode this only allowing Short Message Service and limited voice bandwidth, we witnessed this between the 03-10-2023 and 10-10-2023, despite the limited bandwidth for WiMAX and 3th Generation LTE, cellular networks are still able to provide a minimal operational level of communication.
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Of course, the redundancies are just that, back up, eventually those diesel generators will run out of fuel and if power is not restored, the towers and switching centres will fail to function. As it stands 3G LTE is only available in limited areas of Gaza, most cellular services offer WiMAX and WAP along with GSM:
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Interestingly due to how small the Gaza Strip is, most phones can still pick up the roaming repeater from Egypt:
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I hope this answered your question.