(1)hi i'm so new at this can someone briefly explain to me how all this work, i hv a few phones from U.K that i need to open the network, if i insert my sim get the msg:"please insert correct sim", sort of network block.. i've read a few forums already but i don't understand mostly, what's BB-5, i checked under battery of one of the phnes 6300-reads 217. (2)what is a "calculator"is it software to use with phones, is it used with the box-thing? Can one unlock phones without using a Box? What u think i should know as a start? or give me usful reference,i read if one do it wrong u can block ur phone totally. so please give me correct, reliable info as i trust this site...