Since April, I've been the proud owner of a smartphone. Since I don't have time to play games on my phone, I have no complaints about its speed or battery life. As of 22.00 hours, approximately +/- 30% of the charge will still be available. When using 4G networks frequently, the charge on the battery lasts significantly less time, and it is not uncommon for the battery to be totally depleted in the evening. When designing modems, engineers would consider the amount of electricity that 4G networks require. Using wireless Internet is without a doubt an efficient use of energy. I believe that folks who enjoy playing games that require a lot of processing power will need to charge their smartphones throughout the day. The sound quality of the headphones (which are not included) is satisfactory. The cameras are simply good; there was no "WOW, what cool shots" moment during testing. Regarding the capabilities of the phone, there is not a single doubt. The connection holds up well, the interlocutor can be heard clearly, and there is a sufficient amount of noise reduction taking place throughout the talk. The purchase of a smartphone is strongly recommended.