BIMx (for version15) is a free iPad/iPhone app but you will need to purchase a license to create the file from Archicad.
It will only allow you to see the model in 3D - not plans or elevations as such.
It was known as Virtual Building Explorer in previsous versions but VBE can not be saved to iPad/iPhone.
Barry.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10