Originally Posted by
docbert
Yes and no. Boost Mobile use both, but any individual SIM uses only one network.. The SIM's I was referring to above were T-Mobile-based SIMs and have no access to the AT&T network.
(Boost Infinite is different, and does allow cross-network access)
I was pointing out Boost has sims for multiple networks which is confusing because there doesn’t appear to be an option on the Boost website to specify the preferred carrier network with the plan. Red Pocket lists the network with the sim which does matter regionally.