Here is my long and sordid tale:
My wife and I have both had LG-G2 phones for over 2 years, with no issues whatsoever. We're on the Sprint network, not in one of their major markets. I work in the main town, and we live in a very small town on the outskirts of coverage (probably just one tower covering the whole town).
Last September I went swimming with my G2 in my pocket. It didn't die completely and I managed to limp through the last few months of my contract using it until I was eligible for an upgrade. Since LG had done well enough for us, I moved to an LG Stylo. I didn't want the curved screen phone they were selling at the same time.
Since I went to this phone in January, I've had problems with not receiving text messages, my morning alarms sometimes don't go off, and now apparently I'm sometimes not receiving phone calls or voicemail.
It was so bad I bought the extended service warranty and traded in the Stylo for a new Stylo, thinking it was the phone itself that was bad. The new handset promptly had all of the same problems.
So the problem is the phone itself. I do some more research and see some of the potential solutions. I convert my messaging app to Google's Messenger, and that fixes the MMS messages not downloading issue. But I'm still not always getting text messages. I changed my alarm program from the default to Alarm Clock Plus, but I'm not sure that that's fixed that problem. I think once every two weeks it doesn't go off. One morning I woke up early and sat and watched the phone. My 6am alarm didn't go off until 6:02. Something in the phone software is stalling or locking up on sending timed alerts, I'm guessing.
This morning I find out that my carpool buddy both called *and* texted me last night to let me know he wouldn't be going in to work today. I have no record of either attempt to contact me. There was an internet outage most of yesterday due to storms, and so I had Wi-Fi turned off on my phone to avoid it running its battery down trying to find the internet thru the wi-fi. Internet was back up by last night, and the phone had been working earlier in the day. The issue should not have been a network problem.
I've installed the MightyText app mentioned earlier in this thread to see if it helps me with messaging. I've also put it on my Samsung Galaxy Tab tablet. The text message history it shows does not show any missed messages from last night, but if it's pulling from the phone it might not.
It's to the point that if there's no improvement this week I'm going back to the store and try to trade this piece of junk in for a completely different phone.
The fact that we've had no problems with our LG-G2 tells me it is NOT the Sprint network that's the heart of the problem. In the forums I've seen people complain about messaging and alarms for LG devices, but we never had any problems before. Something about the Stylo is off. Maybe their software doesn't sync properly, or they've pre-loaded it down with too much junk software (one of the issues I originally went in for was it was slooooow to respond to screen touches. The memory on it was almost full, and I'd only installed a couple of apps, and none of them were huge. It's a bit better now that I've deleted some of the stuff I don't want or use and moved some others to an SD card).
I'll let you know if MightyText helps me any over the next week. If it merely echoes text messages from my phone to my PC and tablet, then I'm not expecting it to change anything. My phone not receiving the messages should equal my PC and tablet also not receiving them.