How long will my phone last?

I currently have a iPhone 6s Plus. I financed it with Verizon in August but I just paid the whole thing off to lower my bill. It serves me well and I don't need a new phone even though I always want one (same way about cars lol). My previous iPhone 5 lasted me 3 years I was wondering if you think I can get the same time out of mine? The battery in iPhones die fast when they are older.

Where is the dialer on WhatsApp?

I'm using the latest version of the official app with iPhone 7. When I press the phone icon I only get a list of my contacts who are using WhatsApp. How can I dial the number of someone not in my contacts list?

How does Verizon data on a smartphone work?

Ok so I'm planning on getting a smartphone (probably an iPhone se or 6) with Verizon. I would get the unlimited data plan that sounds the best in my opinion. BUT. How does data work? It says that I would have to pay 101 something dollars every month. Is it just 101 dollars every single month or does your bill vary if you use less or more data/texts/calls?

What weather app reads weather alerts to you?

I was in the dentist today and this ladies phone went off and said "A tornado watch has been issued for your area" Her phone was in her back pocket. I want to know what app this is so I can download it. She had an IPhone. I was going to ask what it was but before I got a chance they called her in the back.

Really good camera for photography under $900?

I want a camera that has better quality than an iPhone 7 because a lot of cameras I use look like if I hook it on an iPhone. Is there a good camera under $900 that is really noticeablely good quality over iPhones? Or in general?