How to hide an app on an iPhone?

Do my friend is really nosy and she can't keep a secret and I have a period tracker app and she's coming over soon and she always looks through my phone and if her tell her off she gets angry at me and we fight. I've tried hiding things before on other pages and in irrelevant folders but she still finds them. Where should I hide this one. Please help. I still need access to it though so not like deleting it or anything.

Unknown number keeps calling me?

I'm an 11 year old female. (If that helps) But they have been calling for the past two days once every hour. And i don't know if it's the same for iPhones and Androids, but on my iPhone when I click on a random number in my call logs and click the little circled i, it will tell show me the location the call came from, the time, and the number. But when I click the circled i for the unknown number, it shows NOTHING! All it says is "Unknown Caller". Usally i don't answer numbers I don't know of unless the numbers start off with my area code but I stupidly answered it and thought if I answered the unknown number they would leave me alone.So this last hour, they called about 10-15 minutes ago. So when I answered I said "Hello?" and it sounded like they screamed or mumbled. I don't know what it was, but it sounded VERY SCARY! Then they just hung up. Ik that they ll call again, I just know it, because if they were gonna leave me alone, they would ve did so when I first answered them the first day they called. And also there's no number to block, so what can I do? Should I tell my mom and dad? And I'm so scared and paranoid, that I'm scared to walk up stairs. I don't know why, but I think something is gonna jump out. (I'm so paranoid lol) But my room is downstairs anyways, I just go up there sometimes to look around, and plus my brother is up there. But fr, what should I do?

How do i fix Wi-Fi on iPhone 6?

Already reset iphone network settings and reset the Wi-Fi router even though the problem is my phone as the Wi-Fi doesn't connect properly on any Wi-Fi. Phone is on the most recent software

Why iphone uses too much internet?(Wi-Fi)?

It used 140 mb without me using any app or thing that uses internet(i had an app that tells me how much data i uses).
what's is weird is that when i signed out of apple id and restarted iphone 4s, internet usage stopeed.
could someone be spying on me?

What does it mean when you're calling someone and you don't hear anything? Is the phone dead

I've been trying to call my cousin, and it's definitely not my phone cuz I can call everyone just fine. When I call him I literally hear no dial tone nothing it sounds like air? Then it just goes straight to voicemail after a while. Then when I look at the info it saids the out going call was "1 second" or when it goes to voicemail it saids "3 second"

Does it mean their iPhone is more likely dead or off or something? I haven't heard from them either last we texted was wendsday

Why can't I play YouTube in the background anymore?

I've recently been having problems playing YouTube in the background of my IPhone. Every time I try to use it in the background, it automatically closes and opens up my music downloads. Is anyone having this problem?!