First, Amiga and Amigo are two different words so there is no likelihood for confusion.
So if my nick was RobertJDöhnert there would be no likelihood for confusion? After all they are two different words.
The Amiga is a retro operating system, that no one in consumer technology space knows even exists anymore except for us few.
AmigaOS 1.x and 2.x are retro, arguably 3.x is too, but certainly not 4.x. And I think there is considerable awareness of the Amiga brand; Amino's business is based on the Amiga name which is their only real asset, and a lawsuit was fought over the AmigaOS trademark so it must have some value. Plus this phone company must think it has some value or they wouldn't be bothering to rip it off.