convert ipad app to run on iphone (universal app)

I have a working iPad app which I now need to make work on iPhone. I've been reading around a fair bit开发者_运维知识库 on this, but haven't found a good answer. On this site, I saw some discussion... but again, no definite answers.

Does anyone know of any tutorials? I have captured in my code whether it's an ipad or not - so it's all ready - I just need to actually get it on my iphone to test!

Thanks for any info

actualy you just have to change TARGETED_DEVICE_FAMILY in project settings to run app on bouth devices. Everything else is just alot of if's :)