If you’re using a 2G device or a 2G SIM card you’ll know because you will see either 2G, Edge, E or GPRS instead of OVO 3G or 4G. This info is right on top of your phone next to the network strength. Please note that all OVO SIMs are 3G and 4G enabled
If you’re using a phone or tablet that has only calling or simple text messages that might also be a clue. If your phone or SIM is 2G you will also be unable to use your phone for internet or email.
Here’s a list of the most commons 2G phones:
Samsung GT – C3520
Sansung GT – E1205T