Vivo Y55s is actully a good mobile but it is very poor in net work connnecton . so because of this problem when ever we go outside of the city or town the network connction is totally absent . so we cant use the mobile in that situation. Vivo is a forgein company. so in India customer care service centers are very poor . actually this company mobiles are high cost. middle class family people are not afford expancess on thess mobiles