This may be a fluke and it was not intentional but I figure why not explain what happened to me when I ported my number to Verizon then had to return. I travel often for work and have experienced terrible AT&T service in some cities I travel to frequently. So long story short, ported my number to Verizon and purchased a 4G LTE phone only to find out 8 days later that the sales rep lied about their service in PR, which is where I live. I immediately ported my number back to AT&T, which kind of sucked as LTE is amazing but now I am back on AT&T with no contract and no fees. Originally, I was going to pay a small ETF but since I came back within the grace period everything was waved and I am eligible for an upgrade.