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Could it be that Apple plans to reveal iPhone OS 4.0 as early as March 14th? Multiple sources have received anonymous tips pointing towards a demo of the new OS by Apple next month. This date roughly coincides with the first iPad ship date, and has led to speculation that iPhone OS 4.0 may ship on the new device.

Apple has typically announced updates to its iPhone hardware in June. This year should be no different and the company is expected to reveal its fourth-generation iPhone on schedule. What has thrown industry watchers off track is that the iPad was announced in January running iPhone OS 3.2. This operating system is not yet available Apple's heralded smartphone.

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.

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.