This weekend I learned an important lesson: don’t try to make a double phone switch moments before leaving home for the weekend. The call to Sprint went well enough and she assured me the changes would take effect within 4 hours. They didn’t, of course, because the agent had skipped the important part where I need to reprogram my phone with the new number. She said it wasn’t necessary, so I went along…doh, big mistake. Coming home late Sunday night I discovered the next surprise: Sprint customer service is not open 24/7. On Sundays, for example, they’re only online from…