Berkoh

AT (AirtelTigo) started to issue USIMs recently

The USIM has a few visual differences such as that the bottom half has blue and red colours whereas the SIM has a wholly white background.

With the new USIM, 4G could be used when it becomes available.

In contrast, with the old SIM, even if there is 4G signal available, only 3G/2G signal could be used.

One may consider a SIM replacement now in order to avoid queuing when 4G is announced.

SIMs with only TiGO, Airtel, or Glo are unlikely to be USIMs.