Prepaid Set Up

I just put my daughters phone onto a Koodo Prepaid Plan. The set up went well. However, I have two questions. When I removed her battery to locate the IMEI number, there were actually TWO different IMEI numbers. Any idea why? Which one should I use? Secondly, once I received online confirmation that everything "appeared" to be fine, how long does it normally take before text messages or phone calls can be made? (A Talk Booster was also purchased.)
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