OmniFob is not compatible with iPad or Android tablets at this time.
Each OmniFob can only be paired to one phone at a time. If you pair your OmniFob to another phone, the original phone will lose its bond to your OmniFob in the Keyport app, but it will stay connected in the Chipolo app (if it's already been added to Chipolo).
For security, your OmniFob cannot be paired to another phone in the Chipolo app until you remove it from your Chipolo list of devices manually.