You do nt state which plan you are on. There is no plan for a single line that cost anywher close to $140. If you;re also counting a device payments an insurance those thigns aren't going to go away just because you join someone else's plan. And those things shouldn't be counted as par tof you "phone" bill. Those are OPTIONAL things that people choose to have.
The most expensive unlimitei plan for 1 person. Is above Unlimtied which is $95 plus taxes and fees( should be $5-$10 depends on where you live )and Apple Music is included in this plan at no exxtra charge. As far as a pamphlet you can get those online. I'm pretty sure Apple's website has all the information you need about your device
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Doing a simple internet search for 'getting the most from your iphone' turns up many sites, links, youtube videos which should help figure out your phone. There is probably an iPhone dedicated forum (like this one) for you to post direct questions/issues to iPhone users/support only.