Benq-Siemens EF 81, swan song of Siemens phones, made after benq purchased the brand and just before they stopped making phones. It's a stylish little thingy, reminiscent of moto razr. It has
BenQ-Siemens EF81 review - Mobiset.Ru
Cameron Sino Replacement Battery for BenQ-Siemens EF81, S81, EF82
Battery for BenQ-Siemens Mobile EF81 by Maxbhi.com