Can I use an old verizon OR tmobile cell phone on my at&t plan?

R M

New member
Lost my iphone yesterday but was going to be able to get a discounted upgrade in January. So I'd prefer to get something easy and cheap to use with my plan until then, but I only have an old Verizon LG cell and an old TMobile cell. Is there any way I can use either of them? Any advice? Thanks in advance!
 
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