The battle between

Google

(GOOG) - Get Report

and

Yahoo!

(YHOO)

to stake claims in the mobile space continues to heat up.

On Wednesday, Google announced a partnership with South Korea's

LG Electronics

, the fifth-largest maker of handsets in the world. Under the agreement, phones from LG Electronics will feature one-click access to Google's search service, and will include other offerings, such as maps, mobile blogging software and Google's email software.

The handsets will be marketed jointly by the two companies and will start shipping in the second quarter. Google has previously made similar arrangements with other mobile giants, including

Samsung

,

Motorola

( MOT) and

Sony Ericsson

.

Google's move comes at a time when rival Yahoo! is making an aggressive push into the sector. On Wednesday, Yahoo! announced a new partnership with mobile operator

Virgin Mobile USA

. Under the agreement, Yahoo! services will be available for Virgin Mobile's phones starting in April. Some services will also be preloaded on phones in the future.

Yahoo!'s latest announcement follows

a spate of moves into the mobile space, where the company currently commands more market share than Google. On Tuesday, Yahoo! announced a

new ad network for mobile devices and said it had further built out its oneSearch service.

By providing users the content they were looking for directly instead of pointing them to a list of links, Yahoo! hopes its oneSearch service will allow it to play the leading role in the emerging mobile search space. But Google, which currently leads in desktop search, also said that it would offer a similar service to make mobile search easier through a posting on the company's blog.

With the explosion of mobile devices able to access the Internet, both Yahoo! and Google have repeatedly noted the potential that the mobile arena holds for their services.

Shares of Google were recently off 65 cents to $462.97; Yahoo! was off 8 cents to $31.47.