No data connection, more bars than county jail !

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http://androidforums.com – I have Samsung Galaxy S Relay, running 4.1.2. Very often I will get a message that there is no data connection when I try to make a call, even when I have more bars than the county jail. This can happen at any time, but it more often happens when using bluetooth, and out of any wifi range. Other times it works fine. It happens most often just when I need to place the call NOW. How can I stop this? (General)