well here are the price but I am concern Mobitel is best coz I used Dialog WImax/HSDPA but both are not worth just Worst.!
if you want to buy mobitel then I can tell you the Signal Strength is best always 100% in some times(rain) 90%<
but dialog always GPRS or EDGE you have to move near to...
How to Unlock ,Speedup ,SIM Change of E220 Modem
Here is the blog which written down by me so read up it if you don't understand then Email me I will solve down them as I could;)
http://e220unlock.blogspot.com/
Don't Forget to Put a comment after your read this .!!!!!!!!!