I want to preface by saying that I did already search the forums and was unable to get an answer. I have an iPhone 3G I purchased back in Dec and recently the silent switch fell off. On that top of that, my calls have been dropping like crazy. I took it to the genius bar and the guy ran a diagnostics on my phone and told me that my phone was indeed dropping calls and he would swap it with another iPhone 3G 16GB. Since they were swapping out my phone, I was hoping I could pay them to upgrade to the 3GS. Has anyone managed successfully to do this? Or do you think they will eventually run out of stock on the 3G 16GB and just start giving out 3GS's at one point?