Thank you. This seems a lot of work and also environmental unfriendly.
Is it possible to implement an option to do all billing on one page?
i need detailed billing for my two phone lines for the last three or four months
Unfortunately, these things are not directly available to most by default.
IF you did not already have detailed billing on your account to start, there is no way for you yourself to see it.. and any past ones will not have it, even if you turn it on right now.
I think this is still something that may be recoverable.. but generally this stuff at that point, is something that needs to be requested, usually by a court order/police request, etc.. Not sure if you can get any more details without something like this.