By Liana B. Baker NEW YORK (Reuters) – Comcast Corp is offering at least two Asian cellular operators access to its WiFi hot spots in the United States, in trial partnerships that illustrate the cable companys ambitions to compete with U.S. wireless carriers. The deals with Japans KDDI and Taiwan Mobile allow their subscribers to use Comcasts WiFi hot spots when they travel to the United States, reducing the international roaming charges that they would otherwise have to pay, according to a Comcast spokesman.