"Taiwan-based heatpipe makers have indicated that although they are able to make 0.6mm heatpipes for use in smartphones, smartphone vendors prefer 0.4-0.5mm models and therefore they have cooperated to develop such products.
Smartphones adopting heatpipes for cooling may not become available in the first quarter of 2014 as originally expected.
Currently, most smartphone vendors have adopted graphite cooling solutions for their products due to mature designs and manufacturing. As for pricing, graphite cooling solutions are priced around US$1-2, while ultra-thin heatpipes are priced between US$1.20-2. However, heat dissipation from heatpipes is 13 times more efficient than graphite cooling solutions, despite their low yield rates, the sources noted."