1. Download VOXOX app from this link: CLICK HERE
2. Now install the app in your device and open it. I'm testing it in my Android phone.
3. After installing, it will send a verification code on your registered number. Complete the verification process using the verification code.
4. Now your voxox app will be opened and the free credit of $1 will be rewarded. You can buy more credits using playstore wallet.
5. Tap "MORE" and then tap on "USER" under settings.
6. Now you will see that a US number is set as your caller id. It means that when you make any call from the app, your US caller id will be visible on the screen of the person whom you made the call.
7. Now, to change the caller id, just tap over "Caller ID" and enter the number which you want to make your caller id and then tap OK.
8. Now tap "CALLS" tab and dial any number you want to make your call at and then make the call.
Now the person who received your call will see the fake caller id of fake number you used in the voxox app.
Note : You can play pranks with your friends also. Just change your caller id with their numbers and call them. Your friends will be surprised after getting a call from their own number.