There's no benefit from loyalty to any of these big companies, they have no loyalty to you the customer.
Numbers are portable, have been so for a long while now. Subsidized devices are a thing of the past, so buy an agnostic phone and change carriers until you find one that meets your needs and your budget.
The "jetpack" is an outdated piece of technology. An agnostic phone offers the same capability and likely has a better radio. An agnostic phone also avoids the carrier from blocking your hotspot capabilities. The _only_ benefit to a "jetpack" is if you have one directly connected to external antennas... the external ant connector has gone away on all modern handsets.