The Spanish handset maker Geeksphone has released some specifications for its Revolution phone, which will allow users to change operating systems without voiding the warranty — it will come with Android as standard, but users will also be able to install Mozilla’s Firefox OS (or Boot2Gecko, as it’s known in the case of non-Mozilla partners such as Geeksphone). Now we know the Revolution will be based on a 1.6GHz Intel Z2560 processor and will sport a 4.7-inch IPS qHD screen. It will have a 2,000mAh battery and an 8-megapixel camera with flash. It will also have expandable storage, although Geeksphone hasn’t specified the built-in storage yet.

Strong encryption may still work, despite the best efforts of the NSA, but a new research paper suggests that clever audio analysis can recover users’ private encryption keys. The exploit takes advantage of the fact that processors make noises that can sometimes betray what they’re doing — noises that even a mobile device’s microphone can pick up. Actually doing this would require a very, very specific set of circumstances, but the heavily paranoid might want to make sure they’re using the latest GnuPG RSA encryption software, namely version 2.x.

Instagram released a blog post on Thursday detailing the results from its foray into advertising content, which rolled out on November 1, and it seems like the company is happy with the data. The company pulled research from the first four programs, with standout data coming from Levi’s and Ben & Jerry’s: the former reached 7.4 million people over nine days, and the latter reached 9.8 million people over eight days. The key metric for Instagram seems to be “Awareness,” as it boasts glowing ad recall increases for both brands. It’s early days, but the ads seem to be doing what Instagram wants them to do.

Maybe it’s not doing so bad after all: All Things D‘s Kara Swisher reports that Fousquare has closed a $35 million Series D round, led by DFJ Growth and the Capital Group’s SMALLCAP World Fund. Swisher says that the round does not significantly raise the previously estimated $600 million value of the company, but it’s definitely better than the $41 million in convertible debt it took earlier this year. Crowley told Swisher that the money “validates” Foursquare’s transformation into a “smart” passive location app, but it’s still early days — Foursquare still needs to perform before that will be true.

The newly-launched Jolla smartphone, made by a crew of mostly ex-Nokia employees, is now available for purchase by people in the EU, Norway and Switzerland through the firm’s new online shop. This will be the third batch of €399 ($546) Jolla handsets to go on sale, with the last one having been largely aimed at patriotic Finns. Jolla said on Thursday that already-ordered phones would be delivered in time for Christmas – there’s been a hold-up due to “some technical logistics issues” — while newly-ordered devices will ship from January.

Xbox Video, Microsoft’s video rental and download service, has finally found a home on Windows Phone 8. Anything you’ve already purchased through the service can now be streamed or downloaded to your WP8 device, provided you have the app installed. You can also buy or rent content directly from the app itself. This feature was originally built into Windows Phone 7, but Microsoft pulled it for WP8, so it’s nice to see it back in the form of a standalone app.

Ingress, created by Google’s Niantic Labs, is hard to describe: the real-time, location-based mobile Massive Multiplayer Online (MMO) game also draws in features from the Alternate Reality Game (ARG) genre to keep users enthralled in a kind of global war, and its beta game culminated in a worldwide party that took place in both San Francisco and Buenos Aires. Now, with that chapter finished, Ingress has exited beta and is now available for free on Google Play. The app already has more than 1 million downloads and boasts players across the globe — just be prepared to lose some serious battery life.

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