The code given in the README seems broken:
<?php in (function_exists('cfmobi_mobile_link') { cfmobi_mobile_link(); } ?>
I can't find any reference to an "in" function in PHP. Is it supposed to be "if"? There also seems to be a missing close-parenthesis.
<?php if (function_exists('cfmobi_mobile_link')) { cfmobi_mobile_link(); } ?>
Adding the latter version to my non-mobile theme works as expected.