hehehe... i don't know if you can modify the phone to run on a bigger size memory cards. if ther's a possibilty to modify the phone you have to do some tweaking with the hardware and firmware stuffs. about the n73 bro im not sure about that coz i dont own an n73 but i guess meybe yes, specially if you own a ME coz that model was intended for music so the factory would set it at to hold bigger capacity memory cards. bout the k810i iv read bout the se-nse.net that they have successfully installed a 4G M2 on thier phones but im not sure coz i dont own a k810 too. so all i can suggest bro is you better try it for yourself.