Yep. I have the same problem. I have not done the testing you've done but I occasionally get the Nokia tune instead of the ringtone that SHOULD play. The next call will usually be the right tone.
I guess we have to wait for our patch now
I'll probably have my interview when i'm 17 since i'm not 18 untill late July. Do you think they'd concider age too? Since i know university is for any age.
Thank you :)
xxxxx