Default What are the implications of switching SIM-s in Android phone?

What are the implications of switching SIM-s in Android phone (if any) other than provider/phone # change? I have never had a phone with SIM before (have been with VZW for 18 years)

Specifically I have Moto X Developer Edition for GSM Networks and 2 SIM-s with different numbers: one from GoPhone and another from H2O. I initially activated it on H2O with temp number just to see if I like this phone. I then ported my main number from PagePlus (Verizon MVNO) to GoPhone and now it has GoPhone SIM in it. I wonder if putting back H2O SIM can possibly screw up something in the apps or phone settings.