I’m Frustrated

No service I phone 4

Just bought an I phone 4 today from Walmart under koodo, my old number was switched to my I phone and was working fine when the employee set it up for me. I'm a delivery driver so I need my phone for work it was working fine for a few hours but then all of a sudden it decided to tell me I have no service I turned it off and restarted the network and everything but no matter what I do I have no service. Not to happy right now can't get ahold of my wife. So if you could help me out it would be much appreciated.
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