questionsis nexus 4 on a prepaid unlimited plan the best…

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I think the Nexus 4 only runs on GSM / HSPA+ networks (think T-Mobile and AT&T networks), and does not include 4G LTE functionality. You can get pseudo-4G speeds on HSPA+, but not as good as true 4G LTE.

If you can live with that, and you're an Android fan, then it's a good deal.

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Also:

Nexus 4 doesn't do WiFi calling
It does not have expandable memory (no micro SD slot)
No removable battery.

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HSPA+ speeds on T-Mobile 4G will often be as fast or faster than current 4G LTE. T-Mobile operates an HSPA+ 42 network with enhanced back-haul while AT&T only operates an HSPA+ 24 network, meaning top speeds will be 24 Mbps on AT&T and 42 Mbps on T-Mobile. Average speed for 4G LTE is anywhere between 7-50 Mbps, depending on network capacity, back-haul, signal strength, device, and carrier caps in certain areas.

HSPA+ is not "pseudo" 4G, it is 4G. What the writer is referring to is standards for 4G that were previously set up. The problem is, technically speaking, LTE is not 4G either, according to this standard. Under the new standard, because of the capability of HSPA+ to be on par with current LTE networks, they are both 4G, just different kinds. Another 4G network currently in use is WiMAX, which technically isn't 4G either. TDD-LTE/LTE-Advanced and WiMAX 2 will be the first "True" 4G networks in compliance with former standards.

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Not being used on a CDMA network is most certainly not a con.

The ITU revised the "4G" specification to include existing technologies, as ilnewsome alluded to.

Also, the Nexus 4 in fact has an LTE modem in it which can function on ATT/Rogers band 4, though it's not widespread and it involves tinkering. As for the battery, it's easily replaced with a Torx screwdriver and some elbow grease to free it (a note on the battery: stay away from Qi mats. A great deal of the energy on induction charging is wasted as heat and simply puts more stress on the battery chemistry).