User-agents, such as robots, that do not understand the <iframe> tag will index the alternative content within the iframe tags — the link to the standalone TMTX site and crawl the content they find there.
The behaviour of user-agents (including search engines) regarding the parsing of mark-up within the <iframe> tags, if the <iframe> element is not understood, is described at the end of the HTML 4.01 specification for inline frames.
This mark-up would reside on the Bell.ca website and represents a deep-link from a Bell HTC Desire-Z support page into the Desire-Z GTS site.
UPDATED: The link has been updated to show a deep-link into a specific article
<iframe src="http://gts.bell.ca/faqs/item/?lc=en&p=htc_desirez&a=turning_data_roaming_on_or_off" frameborder="0" scrolling="auto" marginwidth="0" marginheight="0"><a href="http://gts.bell.ca/">http://gts.bell.ca</a></iframe>