As I mentioned earlier, Google Voice is currently only available in the United States, so it may not be possible to buy a Google Voice number directly in Nigeria. However, there are a few potential workarounds that you could try:
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Use a virtual phone number service that provides U.S.-based phone numbers. These services may allow you to purchase a U.S.-based phone number that can be used with Google Voice.
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Look for online marketplaces that specialize in selling Google Voice accounts, these phone numbers are called "Google Voice PVA" or "phone verified accounts" and they are phone numbers that have been verified with a phone call or text message, they are commonly used in mass marketing, social media marketing, and other automation to use with multiple google account (Gmail, youtube, drive, etc) to avoid google restrictions.
Please note that these methods may not be guaranteed to work and they may not be compliant with the Google Voice terms of service, so you should be careful when using such services. It is also important to note that using automated bots or services to create multiple Google Accounts and using them with Google services is against Google's terms of service and they may terminate your accounts if they detect such behavior. Also buying an account from a third party might not be a guarantee of quality and google still have the right to terminate your account if they detect any violation of their terms of service.
It's also worth noting that even if you buy a Google Voice number it might not work for all the services provided by Google Voice, such as call forwarding, text messaging, and voicemail.
If you want to buy bulk Google voice then you need to go to this third-party website.