Netscape 4 did not support iframes. It had something called layers. AFAIK all modern browsers support Iframes. The blackberry presents both frames and iframes as links.
The blackberry is particularly useful with framesets that contain navigation in one frame and content in the other. Due to limited screen real estate it is advantageous to not waste space on navigation when you can simply go back to it.
See first in a regular browser and then in a blackberry:
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