The term "iphone" has been used before Apple related it to their cellphone device. In Germany another phone company used the term "iphone" for their product. See
www.iphone.de which redirects you to the companies website.
In 2007
Cisco sued Apple for violating their trademark "iphone". This has been settled.
There are some other companies using the name, so I´m not sure if Apple can claim the term "iphone" as their trademark. But they have design rights on their iphone in the US as well as in Europe.