Can I use Verizon Sim Card in ATT iPhone?

I have an att iphone 4 ios 6.01, but my carrier is verizon. I have a sim card for my old Verizon phone but someone told me that it is a LTE sim card and that it is different and won't work even if i unlock or jail break the iphone. Is this true?

Yes it's true, it won't work.AT&T and Verizon use two totally different technologies.