Most holders can old any size phone - but what kind of connection to you want to the dashboard? In days of old, dashboards were steel, so magnet mounts worked, but now the magnet holds the phone, the mount is still suction cup. You can use a vent mount, a CD slot mount, there are mounts that you can mount to the vehicle floor, with a long stalk with the phone mount on the top - but the only way to mount to the dashboard is with a suction cup. (And a little metal plate if the dashboard material isn't smooth enough for the suction cup to adhere.
And after about 2 years in the sun, the suction cup gets stiff, and you have to get a new mount.
I've been using a
Mountek since they came out - it mounts into the CD slot. But when I get sloppy, I just throw the phone into one of the cupholders. I've had the V2- and the G5 - either would fit.