I found this here: http://forum.xda-developers.com/showthread.php?t=2515798. It explains how to enable Spark LTE on your Sprint Nexus 5. Spark is Sprint's new tri-band LTE service. It us available in five markets now, but will be in most markets by 2014. Sprint has not enabled the Nexus 5 to get Spark by default ( like the HTC One Max), but it can get it! It is not in my market now (supposedly), but after enabling this I can confirm I am getting better 4g speeds and am getting 4g in places I never did before. For the lazy, I'll post here how to enable this on your phone right now. You do NOT need to be rooted to do this!!!! First, you need your MSL. Call Sprint and get yours. Please do NOT be afraid to ask. They will give it to you. If they ask why you need it, say you need it for your 4g. You do not need to say anything more. You aren't asking for something horrible. Just an MSL. It's nothing. Second, go to your dialer and punch in *#*#3282#*#* Third, go to where it says LTE and press "edit". Here, you will punch in your MSL. Once you are in settings, enable bands 26 and 41. The band settings are right there. No need to search. Then, once those are enabled, reboot. Bingo! You are set for Spark, whether it's in your area now or not. Enjoy!