How can I use my old number that I was using for Whatsapp on my phone that I lost now,without being asked 4 verification code or being called for voice code?
You should call your mobile provider as soon as possible to lock your SIM card. It will then not be possible to verify the account on that phone again, as you must be able to receive SMS or phone calls to verify an account. After you have locked the SIM in your stolen phone, you can use a new SIM with the same number to activate WhatsApp on your new phone. This is the fastest way to deactivate your account on the stolen phone. WhatsApp can only be activated with one phone number on one device at a time. Cracker Pie
Answers & Comments
You should call your mobile provider as soon as possible to lock your SIM card. It will then not be possible to verify the account on that phone again, as you must be able to receive SMS or phone calls to verify an account.
After you have locked the SIM in your stolen phone, you can use a new SIM with the same number to activate WhatsApp on your new phone. This is the fastest way to deactivate your account on the stolen phone. WhatsApp can only be activated with one phone number on one device at a time.
Cracker Pie