How to create a virtual phone number for Online services

I need a system (it can be desktop or web) the development language doesn't matter, to create/generate virtual cell phone numbers, it has to be numbers from my country Brazil according to the format:

Country Code: +55
City Code: 11
Mobile Phone: 99999-9999

result: +5511999999999

I will need to use these numbers to create accounts for online services like whatsapp, so these phone numbers created have to be able to receive sms, that's all that matters.

Thanks