Contract phone taken from koodo (samsung galaxy s4) cannot detect mobile network

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I got a samsung galaxy s4 from koodo on contract. Currently with my monthly plan, I am using the tab medium to pay for my phone. I left canada for a couple of months, unlocked the phone with koodo to use outside for other network providers. However now the phone is unable to detect any mobile network. I haven't returned to canada yet, but I inserted multiple sim cards and the phone barely detects the mobile network. So I cannot make or receive calls and text messages. What should I do? Any useful advice would be much appreciated!
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Posted 3 years ago

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Look at rikkster's last reply at the bottom of the page:

or follow Chad's suggestions

If that doesn't work, I would try a factory reset as long as your data has been backed up. I had a similar problem with a Note 2 (similar generation) coming back to Canada last spring. It took 3 reboots after putting the Koodo SIM back in for the correct network, time and date & APN to be properly recognized.

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