Yes, you can if your connection is active.
To check your connection status Dial *550# or check via My Airtel App on the top left corner – if the dot next to your number is green, your connection is active.
If your connection is active, you can use your main account to activate Freedom Packs / Data Top-ups.
– Use My Airtel App
– Dial direct USSD code of relevant pack
– Connect to Chat service by clicking the on ‘Chat with us!’ (bottom right corner)