It's funny you mention this because I just dealt with the same exact problem while traveling to New Orleans. I had a great EVDO signal when I first got there but had to soft reset my phone because Outlook was acting up. When the phone rebooted, the triangle popped up and I couldn't get it to lock onto an EVDO signal. The only thing that fixed it was changing the roaming settings over to Sprint only. After I did that, I toggled flight mode on and off and even though it took a few minutes, it did lock back onto an EVDO signal. Once it did, I switched back to Automatic mode and it worked fine after that. I was able to repeat this scenario later in my trip so there's definitely something wrong with the phone coming out of Roaming mode and locking onto EVDO.
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