Who do I contact to submit what will be the next IPHONE/S4 type of devise?

There's nothing on the web to be able to talk to a professional electronics developer such as Samsung LG Apple etc. I do not agree with Apples unsolicited idea policy. Please tell me something i don't know or have not found.

For many legal reasons, large companies do not accept unsolicited product ideas from the general public.

I agree with the previous post. If you really have an idea that's worth these companies time and have a degree or education to match their requirements, I suggest you get employed in one of such companies first and then submit your idea to the internal management. There are countless companies you can consider out there, including small mobile brands.