Google Wallet fix:
Use at your own risk... I'm not responsible for any damage to ur phone.
You need a file explorer that can change read/write permissions, I use root explorer.
I cleared Google wallet from settings, apps, all apps, select wallet. I cleared all and cache.
Open your file browser, system and find build.prop
Make sure to set file browser to read/write, on top of screen with root explorer.
Select build.prop with long press, open in text editor.
I've included photos, change lines lines 13 & 64 only. Make ur 2 lines like what my photos show... Read carefully....
to both equal this: GT-I9300
Save while exiting out of build.prop, go to super user settings. Turn super user off.
Reboot phone.... Test Google wallet to see if works, better use wifi to register first time, takes time to configure....
I turned super user back on after getting wallet working.
Worked for me, let me know or pm me questions.
I don't claim to be the one who figured this out, worked for me, trying to help others.