This mod is for really brave users that really do not care about warranties or anything like that.

..or upgrade with 3G modem but then you need to solder the pci-e connector, antenna cable and use Novatel EU850D with SIM holder.. cut the metal plates and take away the HDD and replace it with half mini zif SSD.

jkkmobile: Modding Viliv S5: 3G and SSD