More developers are targeting BlackBerry and Android mobile platforms, while Symbian is on the decline, according to metrics released Tuesday by DeviceAnywhere at CTIA Wireless 2011.

The report is based on over 350,000 combined hours of testing by more than 15,000 mobile application developers and QA testers. Research In Motion (RIM) maintains the pole position as most tested on manufacturer and operating system despite an overall decline of 13.6 percent over the past 12 months, according to the report. 

RIM continues to have the highest total share of smartphone testing time (45 percent), which is almost twice as much as Android, which holds the No. 2 spot.

RIM devices were among the most tested on all monitored networks, including AT&T, Sprint, Verizon and T-Mobile USA. As a result, RIM has 11 models in the top 20 most popular devices by manufacturer compared to four handsets for Apple, three for HTC and two for Motorola.

As for Android, which also saw a slight decline in testing time share in the last quarter of 2010, Google saw a 1.7 percent rise in usage in January 2011, achieving the largest percentage increase (19.4 percent) in testing over the past 12 months.

Overall, testing on HTC devices has steadily grown in popularity throughout the year, moving up from sixth to fourth position, while Motorola has maintained its leading place as the second most tested device manufacturer in the past 12 months.

Android OS devices are the most tested smartphone OS devices on the Verizon and T-Mobile networks, second most tested on Sprint, and third most tested on AT&T. That’s in part due to the popularity of the HTC EVO 4G, Motorola Droid and HTC Nexus One handsets, which were among the 20 most tested devices in January 2011.

Symbian testing over the past 12 months fell from 4.9 percent in January 2010 to 3.1 percent in the beginning of 2011.

Overall, smartphones are the most-tested devices on DeviceAnywhere’s network. Smartphone usage saw a 16.4 percent share increase over the past year, reaching 65.7 percent in January 2011. Moreover, all of the 20 most-used handsets in that same month were smartphones, with Apple iPhone 3G being the most tested device followed by the BlackBerry 8330 (Curve) and Apple iPhone.

Faraz Syed, CEO of DeviceAnywhere, concludes that the adoption of tablet devices and other connected deviceswill continue to drive growth in devices. “With increasing pressure amongst handset and operating system companies to attract developers, 2011 looks to be another year of transformation for the mobile ecosystem,” he said in a statement.

DeviceAnywhere provides end-to-end solutions that help organizations successfully bring their applications and services to the mobile platform.

The company also announced on Tuesday the creating of a Virtual Developer Lab (VDL) for Qualcomm’s Brew platform. AT&T recently announced that it will use Brew for all of its mid-range texting phones going forward.

Through DeviceAnywhere Test Center, developers worldwide will have access to more than 125 live Brew and Brew Mobile Platform (Brew MP) devices for testing purposes.

To access Brew and Brew MP devices, developers can visit DeviceAnywhere’sVDL for Brew and register.