T-Mobile has announced a no-contract 4G data plan through Wal-Mart exclusively. The new Monthly4G data plan is available for $60 per month and gives unlimited talk and text. You will also get 2GB of data at 4G speeds. For $3 per day, you will also get access to unlimited talk, text, and data. The first 200MB of data will also be at 4G speeds. At $1 per day, you can get unlimited text and 10 cents per minute for talk.

BillGuard has raised $10 million in Series B funding. Investors in this round includes Founders Fund, Innovation Endeavours, Bessemer, IA Ventures, Saul Klein, and Joe Lonsdale. The company previously raised $3 million in Series A this past February.

Yahoo! Inc. (NASDAQ:YHOO) chief technology officer Raymie Stata has stepped down from the company. Raymie will be replaced by Ash Munshi. Below is a statement from the company:

Waze is a social navigation company that has raised $30 million in funding. Investors in this round include Horizons Ventures Hong Kong (Li Ka-shing’s private venture investments), Kleiner Perkins Caufield & Byers, and the iFund. Waze has raised a total of over $55 million thus far.

Consumers have recently started complaining about the iPhone 4S having a yellow-tinged screen. There has been about 4 million iPhone 4S devices sold, but it is unclear how many people have made the yellow-screen complaint.

Forbes has put together an article about how Dropbox co-founders Arash Ferdowsi and Drew Houston turned down an offer from the late Apple Inc. (NASDAQ:AAPL) CEO Steve Jobs. Jobs was impressed by how Dropbox was able to reverse-engineer Apple’s file system so that his startup’s logo appeared elegantly inside.

Apple Inc. (NASDAQ:AAPL) is now requiring customers that want to buy a new iPhone 4S from their U.S. and Canada retail stores to make reservations ahead of time.

Phone 4S is available in store by reservation only. Reserve yours after 9:00 p.m. tonight for pickup tomorrow. When you come in, you’ll choose a carrier and plan, and we’ll get your iPhone up and running before you leave the store.

At the Web 2.0 Summit in San Francisco, Twitter CEO Dick Costolo has revealed an interesting milestone. Twitter is now hitting 250 million tweets per day. Twitter has gone from 90 million tweets per day in September 2010 to 100 million at the beginning of the year. Now Twitter is at 250 million, which is a 177% change.