Changing my whatsapp number?

So my iphone is on a sim contract but then it was blocked for reasons I won't get into. As I reset my phone due to memory, I can't use this number so put my mums number as the 'trusted number' instead. When I use whatsapp will her contacts/number come up or will mine because the app is still being used on my phone with my sim?

(It worked even when the phone was blocked. Only problem is that I can't use apple ID so need to just change the number for the ID).

If my iPhone called 911 automatically but I hung up 1 second into dialing, would it still go through?

I was trying to check Medical ID and accidentally slid the Emergency SOS slider instead. Unlike the single previous time I accidentally slid it, it didn't give me a 5-second warning and time to cancel, but started dialing right away. I instinctively hit the "end" button instantly - less than 2 seconds into dialing - and am wondering if Emergency Services system would have still auto-completed. I haven't gotten a call back but I'm no longer where it went off, so I can't say I know that no officers went to check. I know to stay on the line and report it was a false dial, but I was expecting a "cancel" button once I realized what I did and hit "end call" instinctively in its place before I could think of this. Also, I don't have a SIM card at the moment, so I'm not sure if the call back would go through the 911 transponder or try the phone's normal call system. I'm worried they might think there's an emergency or that I'm trying to play a dumb prank. (Bit of a design flaw on Apple's part, removing the countdown. Auto-call is off, so that's not why it did this.)

Can I use my o2 SIM card in my friends three phone?

Broken my iPhone 7 and want to lend my mates old iphone 7+ as he has a new one for a few days. He Read somewhere that three phones are already unlocked is this true? Or will I have to get it unlocked first

Is there a way to break the activation lock on an iphone 6?

How do I break an activation lock on the iPhone 6? I recently bought an iPhone 6 off ebay in the hopes of restoring the phone to a somewhat perfect condition and using it for myself. The only thing that was wrong with the phone was a cracked screen. I didn't want to spend $600-$1000 for an iphone when i could refurbish one way cheaper for myself. But when i tried to set up the phone, I keep getting the activation lock screen where it tells me to sign in. I assumed the previous owner didn't reset it correctly so i called the previous owner multiple times so that I can maybe get some help with it but I have since gotten no reply. Is there anyway i can take off the activation lock myself or would i need to call Apple and explain my situation to them? I feel like if i did they would think I stole the phone and not give me any help.

How do i break my phone for this?

I cracked my screen on my iphone X and i don't want to pay to have it replaced and it's still covered with warranty for mechanical failure so i want to break it and make it look like it broke by itself so i can get a new one