Iphone 7 vs Iphone 7 plus for watching videos?

I kind of have small hands and the main thing I like to do on my iphone is watch videos from youtube, netflix, anime, etc. I also like to hold the phone with one hand while laying down watching videos so I'm not stressing my hands too much. What would be better for me, the 7 or the 7 plus?

Am I getting hacked?

I'm texting with this guy on imessage, because he wanted so. We chatted on kik, but he wanted to move to imessage, i mean other people usually talk on snapchat. I got to know him online. He has an iphone. Today he asked me if i would like to play chess and he showed me this app called Game Pigeon, he then asked me what type of iphone i have. I have downloaded it but haven't played anything with him yet. I don't know, what do you think? Should i be suspicious?

Why is the actual mAh of a powerbank less than what is specified?

For example, a 15,000 mAh powerbank can only fully charge an iPhone X (2716 mAh) 3 times before the powerbank needs to be recharged. My iPhone X would have only taken 8,148 mAh after its 3rd full recharge from this powerbank.

This power bank is considerably new and has only been fully charged 3 times since I got it.

Is it possible the battery inside the power bank still needs to be conditioned by discharging and recharging it a few times?

I have some serious phone issues. Any helpful responses?

I have an iPhone 7 and I'm having audio issues. When my headphones are plugged in the audio still plays out loud. There's no more to put it on to make it play through headphones. Siri doesn't work and my phone says that there's no microphone to be found. For example,
if I film a video on my phone, there's zero audio. Also, the biggest issue is that I can make phone calls because I can't hear the other person on the line and they can't hear me. Any advice?