Well if your on ATT, you will get a huge speed boost from HSPA+, which is basically what they have been calling "4G" but in reality it's just very fast 3G which is everywhere. If your on Verizon or sprint you are stuck with the slower 3G. Unless you live in a major city, you won't have 4G anyway, unless your on ATT like I just mentioned in which case you will get like 3.5G lol. So it is very tempting for me since I have ATT and really want Siri!