Wireless email address

Can someone help me, and tell me what my wireless email address would be. I
had it before, but I recently upgraded my SIM card to the new 3G one, and
since then I have not gotten any of the weather and news alerts that I used
to get. I still get these messages to my computer email, but I need to get
these on my cell as well. it used to be xxxxxxxxxx@att.wireless.net. Any
ideas on what it has changed to now? Thanks for the help.