How to tell if someone has blocked your number?

Person A is through AT&T carrier, and Person B is through Verizon. It is suspected that Person A has blocked Person B's number. Person B sent an iMessage to Person A, but it does not say "Delivered" under the message, and the message did not go through as SMS and the message remained blue as an iMessage. Additionally, when Person B calls Person A, it goes straight to voicemail with an automated answering service prompting you to leave a message. Has Person A blocked Person B (via the blocking option on the iPhone or through the carrier service)?

Added (1). Person B's iMessage on the Messages app on Apple laptop show that the message has indeed been delivered, but still does not say "Delivered" under the message on the iPhone. What's going on?

IPhone 6s Cinematic Mode - How to use it?

I've bought an iPhone 6s and IIm trying to find the option to access the cinematic mode, what do I have to do? Is there a certain resolution that I have to set or are all videos in cinematic mode and I just don't know it?

Can I sue an adult for invasion of privacy?

My boyfriends step mom got him a phone. Well, the step mom and his dad broke up. But my boyfriend took the phone with him to their new place. But the step mom cut off the service and it was an iPhone so we could still text on iMessage Wi-Fi. Anyway, she shows up at their house& makes them give her the phone. As soon as she got it she read our messages. Then she gave the phone to her daughter's friend. They all got into it and read our messages& and the phone even had a password lock. There were dirty messages & I know it's my fault but you can't say you weren't a teenager once. They would have had to scroll a lot to find them anyway and it hurts me they did that bc I've always been nice to them. She then called my mom and told her everything. This caused me to have really bad anxiety. She said the 2 girls wouldn't ever tell anyone but I go to the same school as them so it's scary. I'm 16 years old and she is around her 40s. She is not related to me or my boyfriend in anyway. Is There anyway I could sue her for an invasion of privacy?

How to make my iPhone's Camera zoom in/out using the Volume Button?

Instead of using the Volume Button to take the picture, i want it to make it zoom in/out. This used to be possible with an app called CamVolZoom. BUT THIS HAS BEEN REMOVED FROM THE APP STORE, so don't recommend this to me please. I'd to know, without jailbreaking it, if there's a way to do so. Whether there's a simply switch to change it in Settings, or if there's an app.

Airdrop won't work on my home Wi-Fi?

If I use anyones Wi-Fi the airdrop works but for some reason if I'm at home and I'm connected to my own network, airdrop doesn't work on any device, iPhone, mac. Yet my iPhone and someone's iPhone can see each other in airdrop on my network. Just not my mac to any iPhone or vice versa.
I tried resetting my router to original settings, cleared settings on my iPhone, made sure restrictions were off and firewall on the mac was off, both Wi-Fi and bluetooth is enabled and discovery is set to everyone.

I know I'm overlooking something but I can't figure it out

Should I buy a used iPhone 5 on Amazon? Is it safe?

IIm currently 14 and I can't really be getting a lot of money.
I've been doing a ton of research and I've found a lot of offers on Amazon for iPhone 5 s for up to £160.
For me this is a great deal but I really don't want to be scammed by some China dummy iPhone. IIm really unsure so what do I do?

How to copy movie in DVD to iPhone 6s plus?

I mean I want to use my new purchased iphone 6s plus to playback my DVD disk movie whenever I like. I often on some business trips, you know, so boring with nothing to do.