My phone is missing whatsapp communication
If your WhatsApp account is registered on a different device, while using your number, you can easily reclaim your account, as long as you can receive text messages on that phone number.

Download WhatsApp on your phone, register your account with your number, and it will automatically close the account on your friends phone.



On a side note, if you're looking to transfer all your messages from your friends phone to your phone, you can transfer the local backup from that phone, to yours.