As the title states, I took my iPhone 4 in due to slow 3G speeds. This is probably related to the capped upload speeds mentioned elsewhere on the forums. In the store the guy was able to get 1Mb down and .07Mb up. A few scant weeks ago I was getting 3Mb down and 1.5Mb up. The guy then notices my custom carrier string, and accused me of jailbreaking. Of course he proceeds to blame my problems on jailbreaking and is ready to kick me out, before the other sales guy whips out his 3Gs and gets the exact same speeds as well as explaining the carrier string edit. He then apologized and said he would contact an RF engineer. So apparently I have a jailbreak I'm holding out on. I hate ignorant support people.