If you have a Nandroid backup you could restore that, then write down your APN and save it some where.
Sent from my Galaxy Nexus using xda premium
HTC Touch Stock Broke
HTC Hero Rooted Gave Away
HTC Desire Z Rooted S-Off Sold
Samsung Galaxy Nexus Rooted Sold
LG Nexus 4 Rooted
Asus Nexus 7 Rooted