If someone from India has optical fiber connection internet for windows10 PC and mobile phone 4g network provider’s internet for android cell phone using 4g sim card, now sometimes he uses PC’s OFC internet in mobile and mobile’s 4g internet in PC using wifi hotspot and both PC and mobile phone’s internet/network service provider companies are different but constant, and he uses 18.104.22.168 and 22.214.171.124 as DNS server instead of ISP’s dns server for PC, then -
1)- Does/can ISP store all his browsing history ? also can/does ISP see/know what he’s doing inside a specific website like what he’s searching on google and which file he is storing in google drive, which files he is downloading, like can they know the stored/downloaded file’s name and content inside? Can/do they see His login credentials for a website? If they can then for how long do they keep the data stored before erasing completely? Does law allow them to do that and does law allow police to get those data from ISP and how much police can ask for?
2)- Does/can network service provider of a cell phone record all the voice calls/messages/whats app chats of a user? If so then for how long do they keep the data stored before erasing completely? Does law allow them to do that and does law allow police to get those data from ISP and how much police can ask for?
**N.B. During the occurrence of all those above said events the user had no police case against him and Police was not trying to do anything at all against/about him and police did not even know his existence at all as he doesn’t have any criminal record in the past at all. But only days later of those events for the first time in his life police may start to try to acquire those above said datas which occurred in the past.
N.B. Sorry for many questions at the same time, but those are so tightly related that I could not find a way to ask them separately.**