I have had this phone (LG Leon) for ~3 years. Bought in the USA, unlocked by the provider when I returned to Canada. Have been using it without problems for 1 year with a Koodo SIM.
Recently returned from an overseas trip and now cellular services (phone calls and text messages) are intermittently but frequently not working. If I attempt to make a call the phone displays "dialing" but the ringing tone never actually begins and call is not made. If I attempt to send an SMS the status says "sending". Eventually the signal will return and calls/SMS can be sent (until the next interruption, which occur frequently enough to make using the phone impossible).
I live in urban Ontario and have not had network connectivity issues in the past. If I transfer my SIM to a different phone, it works without problems.
Any ideas about what could be wrong and any recommendations on how to fix?