Google Sending Verification Code To Old (Wrong) Number: Fix

Is Google (Gmail) still sending verification code to the wrong number (old phone number)? Don't worry, here is the solution to this problem. Google will send a six-digit verification code to the old phone number even if you have recently changed/ deleted your phone number and added a new one. This happens for security reasons. In this tutorial, I will describe why does it happen and how to fix this bug.
Why is Google sending verification code to old phone number
So let's clarify why does it happen? Why is Google not fixing this bug? Actually, this is not a bug. It just happens for security reasons. Let's learn more.
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Gmail is one of the most popular Google services. According to Google, there are over 1.8 billion (1800000000) Gmail users as of October 2018. It's now [year]. So the number is increasing rapidly day by day. So many Google users have been experiencing this problem (sending verification code to the wrong number). We everyday use Gmail in so many places on the internet. With a Gmail account, we are creating so many accounts in so many places. Like in Internet banking, we are using this email. If anyone has access to this mail, he/she can steal money. Those who have access to this mail can access our social accounts too. It means everything associated with this mail can be accessed. So Google ensures the security of all Gmail accounts.
If you need to buy a Google Play Console, AdSense, Admob, or anything related to Google, the seller will give Gmail account too. So you need to change old information including recovery email, phone number, name, birth date, etc. You can change all information. But when you need to change the password again, Google will send a verification code to the old number even after successfully deleting the old phone number. Google won't send a verification code to the new number or new recovery emails. You will face this problem when you will give access to third-party apps or sites and when you need to log in from new devices.
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Recently I have removed old phone number ending with 93 and a recovery mail address from a Gmail account.

After this, I added recovery email and recovery phone number ending with 63.

But still Google is sending verification code to old number ending with 93.

How to fix the problem "Google Still Sending Verification Code To Old Number"
There is no specific method to fix this problem. But there are two effective ways. You need to charge the phone number from an already logged-in device. If you are going to buy a Gmail account, tell the seller of the Gmail account to add your phone number from his device and remove his number.
Another way is to wait. You need to wait more than 48 hours. After the period Google will send verification code to the new phone number or to the new recovery email.
The answer is the same for also the following search terms:
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- Gmail sending verification code to the wrong number
- Google keeps sending verification codes to my old phone
- Google Authenticator new phone without old phone
I hope you have successfully fixed this problem. If you still have problems, comment below.