Why isn't my 3G on my IPhone 4S not working? (Virgin Mobile)?

When I turn my phone off, and then turn it back on it says I have 3G for just awhile, but then it usually goes away? Is it my phone, or the network?

Sprint is upgrading their network extensively over the summer months. This is leaving many Sprint customers (Virgin Mobile being Sprint) with useless 3G signals at best. If yours is shutting down, then your location is likely being updated right now.

You should have received a text message from Virgin Mobile about this, and there's a link on the message for more detailed information.

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