With the launch of BlackBerry Z10, the Canadian-based company has increasingly become desperate to make a comeback as the top smartphone maker. The smartphone received positive response since the company released the device in several markets including Canada and UK. But questions have begun arising if that is enough to determine Z10's success.

The real success of BlackBerry depends on its sale in markets like the United States, according to Mark Sue, a financial analyst at RBC Markets.

In his recent note to clients Thursday, he raised the BlackBerry Z10 sales estimates for the February quarter from 350,000 to 500,000 units but maintained an estimate of 2 million device sales for the coming May quarter by citing strong demand in UK and emerging markets like India and others.

"The U.S. is BlackBerry's largest market... but probably the most difficult to recapture lost consumer share," The Star has reported citing the analyst.

However, in a different statement, William Stofega an analyst from International Data Crop (IDC) said that BlackBerry has to spend more on advertising especially on television. He also noted that BlackBerry should make better use of the company's new creative director - Alicia Keys, in order to raise its profile in the most aggressive U.S. market.

BlackBerry Z10 will hit the U.S. stores by March 28 and many U.S. carrier providers such as AT&T and T-Mobile USA have already started pre-orders for the device. In a separate statement, the biggest network provider, Verizon Wireless confirmed that it plans to sell BlackBerry Z10 after its launch in the country and will open pre-order from March 14.

BlackBerry unveiled two new smartphones, BlackBerry Z10 (touch screen) and BlackBerry Q10 (keypad version) in late January. BlackBerry Z10 is already available in many countries including Canada, UK, Indonesia, India and many more. But the keypad version, BlackBerry Q10 has yet to make its first debut. 

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