One of the magical features of smartphones based on iOS and Android - the opportunity to work as a modem. This feature is indispensable when you need very urgently to go to the Web is a computer and Wi-Fi next to no. It is obvious that in this mode, the lifetime of the battery of the mobile device will inexorably decline, so we look at various connection methods to your phone as a modem and choose the best from the point of view of energy consumption and the quality / rate data.
Thus, the smartphone allows you to connect to it in three ways: through Wi-Fi, Bluetooth, and USB.
Wi-Fi
This connection method ensures a high speed connection, and connect to the smartphone to multiple devices. Thus it is possible "to treat" internet all your friends. At the same time the creation of Wi-Fi hotspot on your smartphone requires preset access settings. Another nasty thing: the habit of many smartphones to turn off Wi-Fi when switching to "sleep" mode, and in general can not be called perfect stability of the compound.
Bluetooth
Connecting via Bluetooth is only possible for a single device, so this is the perfect wireless option "for one person." The connection is virtually automatic, and the connection via Bluetooth protocol provides an acceptable level of safety. A very important point: Bluetooth is more efficient in terms of energy saving. With this type of connection of the smartphone will last longer. The weakest point of Bluetooth is the bandwidth, but given the realities of our severe cellular operators, it is unlikely that many have unlimited calling to mobile Internet without speed limits, but even if there is, tell me honestly, what is the download speed through 3G?
USB
Classic and one of the oldest ways to connect, but it is far from the worst. With this setup the user receives a high data transfer rate and the simultaneous charging of the mobile device. Modern laptops and motherboards for desktops also offer special modes in which the speed of charging the smartphone via USB increases significantly. With all the advantages described USB - it still wiring, which puts it in the lowest line of the mobility and convenience of the parameters. However, if you are currently working in a comfortable environment (there is even a table), then such connection will not interfere.
Total
In the aggregate indicators of simplicity, convenience, portability and energy efficiency combined with the low speed signal reception in 3G Bluetooth networks outperforms Wi-Fi and USB. Your opinion?