I m purchasing these model 19400/- in dec 2013. mobail battery backup good . but overall handset are bad quality . I m suffering very problem and issue. memory problem hanging problem. most aap no using .no download and updating on play store. earlier I m facing charging problem . I vised Sony customer care office sole these problem but its not co-operated. get estimate very high. sole the problem estimate amount new purchases good handset. I repair local store in 150 amount. so I advised all of no one purchase these handset . sony client not cooperated our customer.