Verizon for Android
Verizon works well in my area. Do they offer
a SIM card only option I can put in my phone?
Verizon's LTE phones do have SIM cards, but the Nexus One isn't LTE, so it's also not compatible. And Verizon uses a frequency band for LTE that no one else uses.
So basically, you can only use Verizon phones with Verizon. No unlocked phones.