Samsung Galaxy S 4 (Verizon / Sprint)

I received my S4 three days before they came out for Verizon and it's a really nice phone and everything seems to work flawlessly but after three days I went to check my emails in two accounts and they we're gone, After spending over three hours on the phone with Verizon's tech support and over an hour with Samsung (who were no help at all) the phone was replaced twice and still the problems persists, I had to go back to my IPhone and hate it now, does anyone have any idea what is the problem?