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One recurring issue in the forums is a problem with the phone either not switching to 3G or switching back and forth between 3G and EDGE too frequently. It's not clear if this is a significant issue or if the complaints are just a symptom of Google's less-than-stellar customer support.
InfoWorld writes of the concerns:
Google appears to be only accepting e-mail customer queries, to which it pledges to reply in one to two days -- far too long, say most people who are complaining online.
Many people are also turning to T-Mobile and HTC, but getting little help there. T-Mobile is often referring people back to either Google or HTC for answers to questions. HTC is often referring people back to T-Mobile, according to complaints online.