I have topped up my sim, but the tracker is still not connected to 2G network?

I have topped up my sim, but the tracker is still not connected to 2G network?

1. Please note that some SIM cards can take up to 24 hours to synch the data service.
2. If your SIM card is from EE, please insert it to your phone and text ‘balance’ to 150 to check if there is any remaining DATA allowance, not just credits, as EE deals with credit and data separately.