Another clone is Nanfone NF-9908.BTW, none of these three "manufacturers": Luiton, Zastone or Nanfone has any entry on the FCC database. Kirisun does. This mean that Kirisun is a big manufacturer and have some high quality units that passed FCC certifications (DP770, PT8100/6700/3600...) but the others don't.
Best regards,Carlos EB4FBZ