Strange beeping noise on phone

[Blueblythe]

Hey! So I've been having a problem with random beeping from my phone. It would be fixed after putting my phone on vibrate. It started after I updated it from version 5 to 7.0 and 7.1. I've been trying to figure out what it was, but I couldn't find any solutions online that worked. It would start beeping whenever I start doing anything on my phone and do it in succession. I even contacted ZTE's customer service to figure out what's going on.

This is what it sounds like:
https://www.dropbox.com/sh/3gtpafplrnc6s1c/AACtRCh_5pHGPeTbNK8ZCUK7a?dl=0

Weirdly enough, I had the same noise problem on my old phone, the OnePlus. I noticed when I removed the sim card, it stopped making the noise entirely on the OnePlus. I initially thought it was the sim card, but it's freaking out again as I type this post. Does anyone recognize the sound and what it can possibly be?

 

[Blueblythe]

Update: Just received a replacement model from ZTE via their Advanced Exchange program. I'm even hearing it on this phone. I'm going to go see if it's a sim card-related issue and call my carrier for a new card.

 

[Mikestony]

Update: Just received a replacement model from ZTE via their Advanced Exchange program. I'm even hearing it on this phone. I'm going to go see if it's a sim card-related issue and call my carrier for a new card.

Thanks for the update, and welcome to the forums!

Sure is an odd sound I will say. I don't recognize it at all

Let us know what becomes of it k?

 

[Blueblythe]

Thanks for the update, and welcome to the forums!

Sure is an odd sound I will say. I don't recognize it at all

Let us know what becomes of it k?

Thanks!
Sorry about the late update for this, there ended up being a few hiccups along the way.

So I just activated my new sim card and put it into the device after another factory reset/cache wipe. So far, I haven't heard anything, but I'm going to hold off downloading any apps until tomorrow.
My sim card itself is actually pretty old (received during the Motorola Razr days) and there's definitely a huge difference between both sim cards. Left is the old, right is the new.

Can't test it on the replacement ZTE sent since I was on a 30-day trial period and sent it back already. :/

 

[Blueblythe]

Aaaand I'm hearing the noise again. I've already tried disabling some of the in-built apps (Daydream, email, music browser, cloud print, duo, google tv/movies), and my voice). I've heard 3 beeps since just leaving it on my desk not connected to anything.I haven't downloaded anything yet and haven't even accessed my browser until after the sounds. I'm at a complete loss on what to do next.

EDIT: After having my friend help me look for a solution, I think I maybe found the actual problem.
I've been using a wallet case since it's been super handy, and now I think about it, I started using one on my OnePlus and the sounds definitely did start around that time. He found a video that had the same notification sounds as the ones I'm hearing.

I'll update tomorrow to see if disabling the NFC worked.

 

[Mikestony]

Ah, good sleuthing!! Betcha that's the issue. The device is recognizing your NFC card and alerting you to that fact.
Thanks for the update, it will sure help others I'm sure

 

[Blueblythe]

Ah, good sleuthing!! Betcha that's the issue. The device is recognizing your NFC card and alerting you to that fact.
Thanks for the update, it will sure help others I'm sure

Yea, it seems like it definitely was the issue. No more notification noises!