Fortune's curated selection of newsworthy tech stories from the last 24 hours. Sign up to get the newsletter delivered to you every day.
* Official invites for the unveiling of Apple's next iPhone on October 4 went out yesterday. Piper Jaffray's Gene Munster believes the company will only release one new model -- not an additional low-end version, as some have been speculating -- along with advanced voice recognition features. (Fortune)
* Amazon (AMZN) is holding a company event in New York City that kicks off at 7 AM PST/10 PM EST today. If the rumors are to be believed, it may be the much-rumored Amazon Kindle Fire, a 7-inch reading-focused tablet with a color display. Keep an eye out for our coverage later this morning for details.
* Sprint apparently plans to launch its own 4G Long Term Evolution (LTE)-based network early next year to better compete with the likes of Verizon. (CNET)
* Within one to two years, Facebook mobile chief Erick Tseng believes half the social network's users will access it via mobile devices. (TechCrunch)
* Why Facebook works for all, but Twitter only works for some. (The New York Times)
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