MyStrings - Carrier Name

Hallo,
i have a problem with the Carrier Name i changed with MyStrings.
I'm Italian and i have H3G as carrier (in Italian 3 ITA).
I changed name but then i wanted to return to the normal carrier string, but i can not.
3 ITA (or H3G) is not on the list of carrier (i don't know why). 3 ITA is only 3G, when this type of connection is not possible from 3 ITA i go to TIM.
If i write in custom strings 3 ITA, i will see 3 ITA also when i'm on TIM.
How can i delete all and return to initial settings?
I tried to canc MyStrings but nothing change, have i to canc WinterBoard?

Thanks to all!