OK - you use different styles for blackberry and iPhone users. A little plugin editing should be able to work around this.
edit both the
Mobile Device Thread Footer and
Mobile Device Post Footer plugins and change
Code:
if (($styleid==$vbulletin->options['mo37_mobile_style']) && ($vbulletin->options['mo37_post_text'] != ''))
to
Code:
if (($styleid==xx)||($styleid==$vbulletin->options['mo37_mobile_style']) && ($vbulletin->options['mo37_post_text'] != ''))
where xx is the styleid number of your other mobile style - keep adding more
($styleid==xx)|| if needed...
(untested

)