Hi guys, I'm planning on buying an iphone 5s from craigslist. I'd like to ask if you have any extra tips. I know: 1. Check IMEI on back matches in Settings? 2. Make sure it's not iCloud locked? 3. Make sure seller erases "All Contents and Settings" in front of you? 4. Make sure it's unlocked by testing with own sim card and making a call 5. Inspect condition of phone to ensure it's as described? Anything else guys? Thanks.