No! The type of mobile carrier you use won't affect your use of the Fi Collar or the Fi App.
With an active Fi Subscription/Membership, the Fi collar will act as its own cellular device on the AT&T LTE-M network. Your smartphone can be on any cellular network - it does not need to be on AT&T for the Fi Collar to function.
Note: Without a subscription/membership, AT&T LTE-M network connectivity and Live Tracking/Lost Dog Mode are not available.
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