Google's Nexus 4 smartphone and Nexus 10 tablet went on sale internationally today, and already both have sold out, some just 20 minutes after the Google Play store opened. The U.S. launch is still to come, and could experience similar problems.

Today sees the release of the new Google Nexus 4 smartphone and the Nexus 10 tablet, both announced at the end of October to considerable excitement, primarily over their competitive pricing and their unusual, in the U.S. at least, method of sale.

Eager buyers in Australia, the UK, Spain, France and Germany should all have access to the Google Play store by now, where they’ll find the new phone and tablet all ready and waiting. At least, that’s the theory, except not everyone is finding Nexus Day a very pleasant experience.

Australia was the first to go live, and according to buyers trying to order from the site, the Nexus 4 had sold out in 20 minutes, and the Nexus 10 soon after. AndroidAustralia.com confirmed with Google that the Nexus 4 was indeed sold out, and was told simply to “stay tuned for updates about availability.

It’s a similar story in the UK too, with the Nexus 4 altering from “Buy Now” to either “Notify Me,” or simply “Coming Soon” after half-an-hour. The rush to order one of Google’s new toys was so great, many found they couldn’t access the site, then even if they did get in, adding a device to the shopping basket was impossible.

Reports from Spain and France say the same thing: No stock and terrible trouble accessing the store. A Twitter search reveals plenty of annoyed prospective buyers, with one tweet from the UK perfectly summing up the situation: “Received email to say Nexus 4 is now available. Clicked on it. Sold out.”

Google hasn’t made many friends so far today, so it’ll be interesting to see how it does closer to home. Google isn’t telling anyone when it’s going to open the doors in the U.S., however around 9am PST is now rumored after the initial 12.00am PST target was missed.

It’s safe to say that if you want to be among the first to get a Nexus 4 or Nexus 10, you’ll need to stay close to your computer, as it could all be over very quickly.

AT&T has announced the HTC One X+ and the HTC One VX are both available to pre-order today, ready for release on November 16. The One VX is a competitively priced Android phone, while the One X+ has several key improvements that make it an exciting improvement over the original One X.

The latest smartphones from HTC have been made available for pre-order with AT&T. The network has announced that as of today, you’ll be able to stake your claim on a new One X+ or One VX Android phone, ready for their official release on November 16.

HTC’s One X+ is an evolution of the One X, and has several key improvements over the original. The headline new feature concerns the processor, as the quad-core Tegra 3 now has a clock speed of 1.7GHz, while the internal memory has been raised to 64GB. It also comes with Android 4.1 Jelly Bean as standard, has 4G LTE connectivity and AT&T has bagged an exclusive Carbon Black color scheme.

The screen remains the same size, 4.7-inches with a 720p resolution, as does the camera at 8-megapixels, but the battery has been swapped for a 2100mAh cell. To become the proud owner of a One X+, you’ll need $200 in your pocket and the ability to sign a two-year contract with the network.

Also up for pre-order is the HTC One VX, a mid-range phone available at a low price. It has a 4.5-inch touchscreen with a 960 x 540 pixel resolution, a dual-core Snapdragon processor, a 5-megapixel camera and Android 4.0 Ice Cream Sandwich. AT&T do say an update to 4.1 Jelly Bean will be coming in the future to both the One VX and the original One X.

Other One VX features include Beats Audio, NFC, 1080p video recording and a microSD card slot which supports cards up to 32GB in size. The One VX has been priced at $50, although once again, you’ll need to sign a two-year network agreement.

You can read our hands-on report with the One X+ here, and with the One VX here, then pop down to your nearest AT&T store and order one later today.