With just two days left for the iPhone 3G to go up for grabs, reviews have started pouring in from the US and each one of them hints that you might not witness the long queues outside Apple and AT&T Stores on July 11. We picked up reviews from Walt Mossberg of the Wall Street Journal, David Pogue of the New York TImes and Edward C Baig of USA Today. Baig’s review was the most relenting and Mossberg seemed to be anything but pleased (he writes a cheap Verizon phone had better reception than the iPhone 3G on AT&T’s network), Pogue summed it up pretty well with his headline – For iPhone, new is relative.

We are not here to review reviews, but we picked up some interesting things from these reviews that not many people would know about the iPhone 3G. Apple fanboys beware! You would be better off by skipping this one. For those wanting to buy the iPhone 3G, you certainly would like to read this before you start queuing.

1. The built-in GPS receiver is not strong enough to handle turn-by-turn navigation.

“Unfortunately, there’s not much you can do with the G.P.S. According to Apple, the iPhone’s G.P.S. antenna is much too small to emulate the turn-by-turn navigation of a G.P.S. unit for a vehicle, for example.

Instead, all it can do at this point is track your position as you drive along, representing you as a blue dot sliding along the roads of the map. Even then, the metal of a car or the buildings of Manhattan are often enough to block the iPhone’s view of the sky, leaving it just as confused as you are.” — Pogue

2. The iPhone 3G doesn’t support FireWire and you will need an adapter to charge it with some older charging accessories.

“But I couldn’t juice up the latest device using my Bose SoundDock or Belkin car kit. Apple says there will be adapters to permit charging with certain older accessories.

Technical explanation: The new iPhone only supports USB circuitry, not another method known as FireWire.” — Baig

3. The battery backup on the iPhone 3G is not better the the original iPhone.

“I ran my own battery tests using the phone’s 3G capability. Although I left the Wi-Fi function on, I didn’t connect it to a network, so the phone had to rely on 3G. In my test of voice calling, I got 4 hours and 27 minutes, short of Apple’s maximum claim and nearly three hours less than what I recorded in the same test last year on the original iPhone. In my test of Internet use over 3G, I got 5 hours and 49 minutes, better than Apple’s claim, but far short of the nine hours I got using Wi-Fi in last year’s tests.” — Mossberg

“I started receiving low battery warnings toward the end of a busy work day; I found myself charging the device overnight, the same as with the older iPhone.” — Baig

So what will you do?