Virgin Mobile's rates are attractive, but unfortunately they're a Sprint subsidiary, and as such use CDMA. Nexus 4 is GSM, so your best bet is StraightTalk, T-M

Virgin Mobile's rates are attractive, but unfortunately they're a Sprint subsidiary, and as such use CDMA. Nexus 4 is GSM, so your best bet is StraightTalk, T-Mobile, or other inexpensive prepaid GSM carriers. As others have said, check out T-Mobile's web-only $30/month option. It's about as close as you can get to what we've all been wanting: a data-only plan.