We found a lot to like about the HTC Evo 4G LTE when we reviewed it last month, but it appears the device's Google Wallet integration has been causing headaches for some users. According to several threads at the xda-developers forums, some owners initially weren't able to set up their Google Wallet accounts on the device, with the application unable to process the addition of any prepaid cards. However, some were able to circumvent the issue by changing the build.prop file on the phone to trick it into thinking it was a Samsung Galaxy Nexus — giving the impression that there was some sort of issue on the Google Wallet back-end rather than on the phone itself. In the last few days, a new message has been appearing for users, notifying them that "Unfortunately, Google Wallet has not yet been certified in your country or on your device / carrier." It's said to be appearing both for those that used the Galaxy Nexus tweak as well as those with clean, unmodified systems. We've reached out to both Google and Sprint for insight into the situation, and will update you when we hear more.