Random creepy numbers calling me?

This has been going on for a long while and I don't know who they are from or why
Random numbers call me a lot usually from my country but I also get them from other places
some call at random times but I usually get them when I'm ON my phone I have a iPhone 5c so I attempt to message these numbers on iMessage but it just tells me it failed to send the message so this is starting to creep me out because I just want to use my phone
What can this be? Some of these numbers are also creepy with weird area codes and some just complete unknown…
TELL ME WHAT's GOING ON Please! I've gotten some strange message but I'm scared to open it
JUST NOW! Someone told me "hello John! I'm your insurance agent, solve your problems by calling this number"
THIS IS WTF?!

I wanted a iphone and my mom bought me a 7! Not the 8?

I'm so upset! My mom got me an iphone 7 for my birthday, but I wanted the new 8 and the X was just too expensive she said, but the 7? She bought me old phone! I know the 7 is water resistant, but if I drop it in deep enough water will that ruin the phone? Cause then I can get the 8 please help!

How do me and my friend swap phones?

I have the iphone 7 plus and he has the 7. And we both have sprint so we thought we would be able to keep our contracts but just switch the phones but when we do it gets sim card locked. Do we need to completely reset the phones before trying to put a new sim in it?

Should i get the iphone 6s plus or iphone 7 plus?

I'm debating on which i should get. I have my reasons for getting both. The 6s can be plugged into my aux in my car. But the 7 has a better camera. The 6s plus i'd be paying $360 & the 7 plus id be paying $670. Money isn't the problem. Just can't seem to choose!

Will i lose space updating to iOS 11?

I currently have 4.1 gb on m y iphone se how does updating work with storage on iphones, cause currently i have 9.3.3 still from when i got the phone in may, how much space will i lose or something?

How to make my iPhone stop PINGING every time I barely touch the charger?

I have an iPhone 6, it has an issue of when you BARELY touch the charger it ll PING and becomes uncharged then immediately go back into charge mode.

I can't even breathe on the charger (I'm not even kidding) without it freaking out.

So I bought another charger (off brand) and it STILL does it! I'm going to end up throwing this damn phone!

Is there some why to fix this without violence or is the port on my phone just junk?