WOW, I have not heard the term WCDMA in almost 2 years! Could your problem be related to your Root or ROM? WCDMA is funny and I assume your in South Korea because thats the only place I know (or been) with WCDMA?
South Korea (which my AT&T Fuze did not work anyway. Job gave me loaner) and China have censorships, one day you have it, one day you dont?
Russia, Finland, Sweden, Norway (which have some remote areas) had better service than South Korea.
This is why you really don't here me complain much about Sprint!