First, You need to download the app from the play store
and Login inside it with the help of an Email id.
- Go to The Setting Option.
Click on Go Premium.

Click on Upgrade to Premium.

- Choose the required Plan. Click on continue to payment.
- Click on the Activation key.
- Inside Enter Activation Key, you must enter the activation key that you get from the reseller person.
- After Applying the activation key, your Whatstool account is Upgraded to Premium.
Read Other Blogs - view