Mind blown! If you had to guess how many iPhone 4s would Apple manage to push in three days, you wouldn’t guess 1.7 million would you? And you’d be wrong, because that’s exactly how many they sold.

We wrote about iPhone 4 shortages, but when we’re talking about 1.7 million units sold in just three days, it’s perhaps more appropriate to call it “overwhelming, I can’t believe it’s true demand” rather than “shortage”.

By the way, starting tomorrow, AT&T stores should be able to offer walk-in sales - they couldn’t do that so far, because of said overwhelming demand.

Even Apple is impressed, quoth Steve Jobs - “This is the most successful product launch in Apple’s history”. No, really? The iPhone 3G and the 3GS sold “just” 1 million in three days, so yes, we’d say the iPhone 4 sales are doing pretty good.

Mr. Jobs also apologizes “to those customers who were turned away because we did not have enough supply”. No mention of all those customers crying foul over the poor reception. They were told to stay tuned even though there was no problem (aside from users holding it wrong that is). Makes sense, right?

Ah, well. We guess the problems reported by the first people to get an iPhone 4 didn’t scare the crowd away. Plus, there are already rumors of a 4.01 update to iOS that will solve the reception issues in software.

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Three is the latest major UK carrier to announce that it will get the iPhone 4 at launch. Launching its pre-order campaign on 15 June and starting actual sales on 24 June, Three becomes the fifth UK operator to offer Apple’s latest mobile phone.

Meanwhile O2 announced that it will offer its subscribes an early upgrade if they go for the iPhone 4. You will be able to pay off the reminder of your contract and get an iPhone 4 on a new 18 or 24-month one (AT&T style).

O2 will charge you with 20 pounds for each of the remaining months of your contract, no matter how much you are really paying. That’s about 30% off the cheapest iPhone tariff. This way it will still be cheaper to pay off your contract and get a new one, instead of buying a SIM-free iPhone.

There is a catch of course - you will lose the change-of-mind period option. So once you’ve decided to go the iPhone 4 way, there is no turning back.

A new iPhone, a new price cut. Sure, the iPhone 4G/HD isn’t official yet but pretty much everything there is to know about it has leaked. Anyway, Wal-Mart is cutting the price of the iPhone 3GS down to 97 US dollars.

A price cut just before the launch of a new iPhone is not unusual - the current “old” iPhone, the iPhone 3G with 8GB memory goes for 99 dollars (the 3GS was going for 199 dollars). Now, Wal-Mart is retiring the 3G as the iPhone 3GS is about to become the “old” iPhone as the new one is launched.

Steve Jobs himself is giving a keynote early next month - what else can he do but announce the iPhone 4G (or HD if that’s what they are going for)? However, because of all the leaks people pretty much know what to expect from the new generation Apple smartphone.

Anyone not terribly excited about the new features that the iPhone 4G will bring will surely be tempted to snatch an iPhone 3GS. It comes with 16GB built-in memory, but also a catch - a 2 year contract with AT&T.

Still, instead of buying off the leftover iPhone 3GS stock, it’d probably be better to wait a few weeks more and then make the decision. The iPhone 4G will have some pretty sweet features, like a higher-res screen and quite possibly 720p video recording.