(Related to A phone as a home 4G modem/router?)

I was wondering if it is plausible and safe to keep an old phone charging all the time with a sim card in order to use it as a modem/router for Wifi.

I thought about this idea in order to have a low-cost Wifi for an alarm system. However, my mother is afraid the mobile phone, if left all day charging and running, might explode and start a fire. Is it possible this would happen?

  • Does this answer your question? Does mobile hotspot have security vulnerabilities in older phones? Commented Nov 15, 2020 at 19:04
  • I have seen a lot blown up batteries because of charging 24/7 but to my experience batteries usually do explode very very rarely. Usually such batteries are physically damaged.
    – Robert
    Commented Nov 15, 2020 at 19:07
  • @IrfanLatif I was more worried about physical safety (a fire hazard), rather than security vulnerabilities.
    – Puco4
    Commented Nov 15, 2020 at 19:09
  • 2
    Interesting idea. Your mother's concerns are valid for the simple reason that it's not the designed usage to be on charge 24 by 7 (they are meant to be used in mobile mode). If you are comfortable with rooting a device, look for a device that supports battery idle mode and keep it on charge as explained here
    – beeshyams
    Commented Nov 15, 2020 at 20:31
  • 1
    Further, in light of heating concerns, read this, if you plan to use mobile phone without battery
    – beeshyams
    Commented Nov 15, 2020 at 20:58


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