This is one of the best if not it is thee best smartphone gimbal!I would personaly recomend this gimbal to anyone new or pro.
For new people you can get a 5% off discount if you subscribe to the dji newsletter!

You can buy it here https://store.dji.com/product/om-4
- Good luck with your new

Also I forgot but here is the link for DJI care  

Hello there Drone#27. Thank you for reaching out and for yourt positive feedback for the DJI Osmo Mobile 4. Again. Thank you for your support and please stay safe always.

Please don't put affiliate links on the forum!
That is not allowed.
Look in the forum rules

As an OM3 owner Im not sure why I should upgrade to this one?

More spam - OMG!

Does it accommodate my iPhone in a case???