@will13am
Maybe if your presence was a little more known in the past year then you would be aware of the "3G" fix for customers suddenly experiencing voice call issues (in particular going straight to voicemail) because of the upgrades to cell tower equipment that causes a delay in switching to 3G for voice calls and they default to voicemail.
While the OP hasn't described this issue in particular they did ask for suggestions for a possible solution for troubleshooting that they have not tried yet. Asking the average user to download an app like your suggestion or one like cellmapper without the expertise of someone like @sheytoon to interpret the results is asking a lot......and of you unless you plan on staying tuned and prepared to help them read and understand all of those "geeky" stats and how to use them to troubleshoot.
@Mark_M
You can get your 4G LTE and your 3G network (by choosing 3G only in your connections settings) signal strength by going to Settings>>About Phone>>SIM card status>>signal strength. A reading of -60dBm to -70dBm is very good, -70dBm to -80dBm good, -80dBm to -90dBm okay.....anything over -110dBm is basically unusable. Test in different areas where your signal strength wants or is excellent so you can see which network you are connecting to (or not connecting) when your signal strength is both good or bad.
In am right in Vancouver....just outside of the downtown core but my 4G LTE signal hovers around -100dBm but is perfectly usable. My 3G network signal hovers around -67dBm so very usable.
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