I noticed I strange thing last month, I am on STV-103 unlocked in Romania and I got the January update after January 15 but I was always checking over WiFi. I usually get the updates about 1 week after most of NA and US STV-103 get it and also other countries, today I checked for an update while my Mobile Data was ON and to my surprise, the update was available.

Maybe the folks that check for updates via WiFi should do it over Mobile Data. I will check in March after the update is released on WiFi and after that in Mobile Data, I'm curious to see if I'm right and you are prompted for the update if you are on Mobile data quicker than on WiFi. In theory there shouldn't be a difference.

Maybe someone who has an unlocked STV103 and receives updates a bit slower can test this theory. Btw there is no need to download the update over mobile data, just check for it, if it shows up switch over to WiFi and download it.