I'm having a slightly weird (but no less annoying) problem with my iPhone 4's all glass front/back design. Put simply it slips off fr***ing everything with even the slightest slope. I believed until yesterday that my Sofa (couch) arms were flat, this I thought was proven with many years of extensive beer/wine glass support/testing with not a single drop spilt. My iPhone 4 has proven this very VERY wrong, leave it there and although initially it appears to be secure and steady, after about 10 minutes the iphone slips onto a (luckily well cushioned) landing. Why was this not thought about when Jony Ive dreamt up the 4's design? Ludicrous!!!! Now I now don't know whether my beer is really secure or whether I've been simply lucky up to now.