It wasn't Canonical's limitation. Mozilla can confirm: the barriers to enter the phone manufacturing market are immense. Samsung, Ericsson, Sony, LG, etc, all had solid control of the deals with the network operators worldwide. It's a highly regulated market, you can't get in without Verizon, att, Vodafone etc to let you in. Canonical, Open Moko, Mozilla... Didn't have the strength to push through. Google and Apple did.