Retriving cellphone mail from server

I`m currently renting a mobile (in Japan). This mobile doesn`t allow for external storage and has a limit of 500 e-mail messages it can store. I generally forward the messages I receive to my webmail account but I messed up and deleted two messages today.

I was wondering if there`s a way for me to access the servers and retreive my messages. I`d assume all you need to do is have the PIN code (which I got from the firm) so what`s left is finding a way into the server.

Thank you very much.

P.S.-I`m currently renting an NTT Docomo phone.