I had my phone number ported to Sprint in August of 2011 and purchased an Evo 4G through Sprint. I recently purchased an iPhone 4 and switched out my existing Evo. I want to leave Sprint but I will leave behind a small bill plus a very small ETF (I only have 4 months left in my contract). Now before you all get into the negatives, I just want to know will Sprint blacklist, or give my iPhone a bad ESN if I do this? Would it just be easier to swap my Evo back in place then leave? I ask because it took Sprint half a day to properly update my iPhone. I'm not worried about my phone number because I left T-Mobile with an ETF (which I paid off eventually).
BTW if your wondering why I plan on leaving like so, its because SPRINT SUCKS! They have the worst iPhone coverage. My iPhone speed is like the old AOL dial-up. My sister lives with me and she has the exact same iPhone 4 on Verizon and she can watch a Youtube video on 1 bar; I can only hope to load Youtube with 4 bars on my phone. There are other issues with billing and coverage, but I'm fed up with Sprint.
Also, I asked about blacklisting because I bought that iPhone. If I decided to sell it to someone or eventually pay off what I owe and come back I want to have my iPhone as an option.