I have an old B593 router (used with the old 60+60 special offer prepaid). If I sign up for the new R999 (100+100) LTE-A offer, will the SIM work in the old router, or do I need a new one?
Yes, there is no restriction on the technology used from the operators side, except when dealing with an uncapped product i.e. The uncapped LTE product does not allow fallback to 3G
So providing you are in LTE coverage and your router supports the technology (which the B593 does), then you wont have any issues