Unhappy [Q] mobile data connection problem after rooting sola

hello guys i would like to thank all the users in this site , its amazing site and very helpful but as i'm beginner in all this i would like to share with a problem that i've faced yesterday
AGAIN I"M BEGINNER so please be paceint
after i rooted my xperia sola for the first time i'v flashed the stock rom , rooted it , flashed new kernel , flashed new costum rom every thing was allright i've been very glad util i've found that my mobile data connection is not working and even the icon"E or 3g ..etc" dosent show up
i've tried to choose my network provider manually and tried to download internet settings but still not work !!!