The rice myth kills too many phones...
The worst thing you did was let water fester and corrode your phone for a week while it was sitting in rice. The water is in the phone, on the logic board and under the shields, even under the IC's. The rice is nowhere near where the water is...so how can it possibly help your phone?
Phones that recover from water damage unattended would have recovered rice or no rice...this myth has to die.
Sorry about that, now on to helping you.
* Open your phone and remove the logic board ([guide|23005|follow this guide])
* Inspect the logic board, especially around the connectors and look for corrosion.
* Inspect both sides of the board. Unfortunately, 80% of the board is covered in shields. That's usually where the damage is occurring.
* Put your board in a container with >90% isopropyl alcohol and let it sit for a while.
* Use a soft brush, like a toothbrush and '''lightly''' brush away any corrosion you see.
* Rinse in alcohol and repeat.
* Let it air dry for a day.
* Re-assemble and hope for the best.
A professional repair shop that does water damage repair may be able to recover your phone or the data because they have access to pro-level ultrasonic baths and specialized cleaners as well as the skills to troubleshoot your board.