Sprint customers that bought an HTC Evo 4G LTE have had issues with Google Wallet since its release, but a small update to the apps' Google Play landing page clarifies the issue, saying:

Google Wallet will be unavailable on the EVO 4G until an OTA update in July.

Currently, the app will give (most) users a message saying "Google Wallet has not yet been certified in your country or on your device / carrier." The company confirmed last month that this behavior is due to a software bug, though some enterprising users have gotten Wallet to work by tweaking the build.prop file on their phones. For those who aren't so adventurous, there are only a few more weeks left in the month, so the wait for HTC and Google's official solution shouldn't last too much longer.