I'm contemplating getting an N6, if I do I'll probably hand my N5 to my girlfriend who prefers pay as you go plans (she's currently using a burner from tracfone). Has any used an N5 with a pay as you go service? Do nay of them support LTE?
Yes, it will work just put the Sim in and make sure the APN settings are correct and if you're in an LTE area you will get LTE. One thing to remember is that most MVNO's make you use proxies so your ping times will be higher than normal but not noticeable for most people unless your playing games online.
If you are going to use straight talk one thing you will want to consider is that straight talk said they give you unlimited data but actually will start to slow your speed down if you use more than about 2 gigabytes in one month. I for one had a very bad experience with straight talk as a service provider. They slowed me down after using only nine hundred megabytes and said it was because I violated the Terms of Service by using my phone as a hotspot on a laptop. I told him that was incorrect and I do not even own a laptop and had never use the hotspot feature. Nobody in their customer service department would listen to me so I took the sim out and started using tmobile prepaid service. As for T Mobile as a prepaid service provider I have not had any issues whatsoever other than a few areas where I had no service. Currently I use the 70 prepaid service that gives me unlimited everything at T Mobile. The most I have use in 1 month was about 19 gigabytes and they never did slow me down or cut me off it's totally awesome.
If your girlfriends reason for using prepaid is to save money she may want to consider the fact that prepaid service is for 30 days not for a month. What this means is she will actually make a payment 13 times a month versus 12 payments a month with postpaid service. This is because if you take 365 because that's how many days are in a year and divide it by 30 you get 12.166. Also that none of the prepaid providers let you use employee / corporate discounts. The reason why that is important is because right now AT&T has a special offering 30 gigabytes of data with unlimited talk and text for the same price as the 15 gigabyte data plan. The cost is 130 a month if you work for a large company like I do they will offer you a discount of 15 to 20 percent off of your monthly bill. My company allows 20% off at&t. Meaning that if I switch to AT&T which I plan to do later this month my wife and I will have a cheaper plan then us both being on tmobile. Now yes we will not have unlimited data anymore but the 30gb allowed is more than enough.
So depending on your situation, prepaid may be costing you more money than postpaid.
If her reason for prepaid is that she has bad credit; there's no need to fear... You giving her your phone means no contract so her bad credit (if that's the case) will make no difference.
Good luck!