I gave this one a try as its specs are:
Networking WCDMA , GSM
Frequency 2G: GSM850/GSM900/DCS1800/PCS1900; 3G: WCDMA850MHz/2100MHz
Data Transfer GPRS , HSPA , EDGE
But it seems Sparkecom do not use WCDMA?
So my main question is, how do you determine if a phone is compatible with the Spark network before buying?