In a move said to be preparation for the iPad release, Apple has doubled the App Store size limit on 3G cellular network downloads to 20MB. Previously users were prompted to use a Wi-Fi connection or iTunes to download applications larger than 10MB.

The change could put more bandwidth pressure on the AT&T network, however the company has been frantically working to improve speeds and capacity nationwide ahead of the iPad and 4G iPhone releases later this year.

The Dev-Team could be working on an unlock for iPhone users who have already updated to official firmware 3.1.3 and find themselves stuck with no unlock options at the moment. Sherif Hashim has discovered an exploit that could be used to unlock the current iPhone baseband so the iPhone can be used with carriers other than AT&T.

This exploit was verified by Dev-Team's own MuscleNerd as a legitimate and working exploit. It's possible the Dev-Team would wait until the release of iPhone OS 4.0 on the next generation iPhone before revealing the exploit to Apple with a new unlock, however the new iPhone isn't expected to ship until later this summer.

Well it didn't take long to hear from iPhone owners who tried the 3.1.3 firmware update to fix their existing battery problems. Some people are reporting the same problems, if not worse after updating to 3.1.3 from 3.1.2 or earlier iPhone OS versions.

Previously, many users updated to 3.1 software so they could take advantage of MMS functionality on AT&T and found that an unwelcome side effect was shortened battery life on the iPhone 3GS. (Learn how to turn on MMS without updating your 3.0 firmware here. Some have speculated this has something to do with the iPhone losing and acquiring the 3G signal repeatedly which drains the battery.

Ever wish you could access some files from your iPhone on-the-go without syncing to a computer? Maybe your 4GB iPhone needs some more space? ZoomMediaPlus starts shipping their SD card reading iPhone accessory in April.

The adapter plugs directly into the bottom of the iPhone and accepts an SD or SDHC card. The files can be accessed from the iPhone using this Apple-approved device. The free zoomIt app makes it possible to access, rename and delete files.

Will the next iPhone model be taller than its predecessors by a quarter inch (6 mm)? If these photos are to be believed, iResQ has received fourth-generation parts that show an iPhone with additional space at the top of the device.

iResQ acquired the parts as a sample from what they describe as a "reputable source" and note the fact that Apple could still change the design of the next generation iPhone before official release. Pictured above are parts from a 3GS on the left and a 4G iPhone on the right.