手机客户端访问drupal7的方案？

某个web应用，既要能在pc中打开，也要能在各种手机客户端打开，调取同一数据库，只是theme不同，请问如何做呢？

我先前在网上找到mobile_theme模块 + mobile 主题，但是根据操作步骤（下面英文）下载"设备检测程序“时，却要收费

Alternative detection methods

    Browscap
        Install the Browscap Drupal module.
        Select Browscap in the Appearance settings.
    Mobile Device Detect
        Visit http://detectmobilebrowsers.mobi.
        Download the code and extract it to the Mobile Theme module directory.
        You should end up with sites/all/modules/mobile_theme/mobile_device_detect.php.
        It is recommended you upgrade if on a commercial site.
        Select Mobile Device Detect in the Appearance settings.

请问老葛有更合适的解决方案吗？