The S1 may be the first BLU smartphone to support Sprint's network

The unannounced BLU S1 could be the first smartphone launched by the US-based company that will be compatible with Sprint's network. The “partnership” between BLU and Sprint hasn't been officialized yet, but the S1 is now listed on the carrier's website. 

It's unclear whether the BLU S1 will be a BYOD (bring your own device) smartphone that Sprint customers will be able to use, or it will be sold as postpaid as well. BLU S1 will be compatible with AT&T and T-Mobile too, not just Sprint, so it's up to each and every one to decide, which carrier to use.