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I have a (rooted) smartphone running Android 7.1.2 and need to prove that over a certain period of time in the recent past (period of a few weeks within the last month), mobile data was disabled and roaming was disabled.

If I could extract from the phone a log of exactly when mobile data / roaming were enabled and when they were disabled, this would already be sufficient proof.

Is such a log available anywhere and is there any way to retrieve it?

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    Android has no persistent logs. Only logcat exists but depending on it's configured buffer size and the number of messages per minute old entries are overwritten after some minutes up to several days.
    – Robert
    Jan 6 at 12:21
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    A similar question: Is it possible to somehow understand from the logs what happened to the phone a month ago? Are there such logs?
    – Robert
    Jan 6 at 12:21
  • The Android UI has a panel which shows a graph of mobile data usage and displays the total mobile data usage over a period whose duration is one month and whose beginning date is configurable. This, at least, is some information which my smartphone knows. Unfortunately the graph is too imprecise, I would like to access the actual underlying numerical data, this would already be something useful.
    – Brett
    Jan 6 at 16:23
  • Another problem is that VoLTE uses a data connection for LTE and 5G phone/voice transmissions (otherwise the phone has to fall back to 2G or 3G). More details here: android.stackexchange.com/questions/248997/…
    – Robert
    Jan 6 at 19:15
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    Yes, you are correct. I don't know if the fault is on device or on MNO side (or on both?) but you can get charged for mobile data just because of VoLTE. I have a data plan with 500MB free so this problem occurred last time when I was abroad where I had to use roaming (where my data plan has no free volume). I directly got charged for a few KB every day, but when talking to my MNO I got the money back.
    – Robert
    Jan 9 at 12:31

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