yes, it's isolated at wifi. it didn't work on my mini as well. i did all the logical troubleshooting steps and nothing...
1. delete and reinstall apple store app.. FAIL
2. mimick error on mini... yup FAIL
3. deleted cache credentials, (apple store account and browsing history)... FAIL
4. reseted router... FAIL
MAD
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oh here's the best part, the apple tech was an utter retard.
1. asked me to restart my iphone. i told him that if i do, i will lose the call. i asked if he can call me back if i provide him a call back number. he told me, just call back to apple with that new line. so i told him, "so you want me to call you guys back and wait for 15 mins AGAIN?"... FAIL
2. tech told me to tap into someone's unsecured wifi... i mean REALLY? who does that? and who doesn't have unsecured wifi now... FAIL
3. tech told me restore my device. OMG FAIL
3. tech told me to go to an apple store and use their wifi instead.. FAIL