Android
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Restoring your purchase on your new device
When installing Zoiper on your new device, make sure that you are using the same Google account that you used for making the purchase. This is the only requirement in order for your purchased features to sync with the new device.
Open the Google Play application on your Android, then go to the menu on the left and select the account you used to make the purchase.
Then install Zoiper.
My purchased upgrade is still not available after the purchase
Open the Android settings -> Applications -> find Zoiper and select Force Close. Wait a minute or two.
In case the purchase is still not synchronized, make sure you can access https://oem.zoiper.com from your browser.