I returned it a couple days ago. I didn't feel like owning a defective product even though I wasn't experiencing dropped calls. There eventually will be revised hardware. Whether it's in a few weeks, months, or iPhone 5. I didn't want to take the hit on resale value with a rev A iPhone 4. In any case, I have a micro-sim to full size sim adapter and put Apple card into my Nexus One. All was good and didn't need to stop by ATT to get a new full size sim. Plus I like the idea of having a universal SIM should a newer phone come my way. Just an FYI to those returning phones. I did call ATT while I was in the Apple store to inform them of what I was doing. They were cool with it as well. Also the SIM adapter I'm running is one I purchased off ebay. Black version with the seller claiming they're straight from Germany. They're the exact size of a standard sim. The blue versions are a little too thick for some phones.