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Must a have a modem to hard wire the first unit.
Sorry, there was a problem. Please try again later.The answer depends on how you are intending to hook up the eero to the AT&T Mobile hotspot. For the eero to work one eero must be hardwired to the internet via ethernet. That eero will become the head/gateway eero and broadcast the eero wifi network. Other eero can connect to the gateway eero (wired or wirelessly) and they will broadcast the same eero wifi. eero cannot wirelessly extend a different wifi.
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