I think I'm like most people with the Nexus 5- generally pleased, but confused by the lack of voicemail notification. After a little research, I figured out how to set up a popular 3rd party voicemail app called Youmail that offers full voicemail with notification on the Nexus 5 for free.
Without getting into detail about how these apps and conditional call forwarding works, I'll get right to the nitty gritty. If you have tried to install and run the app, you know that it doesn't work right off the bat. You've probably guessed that youmail thinks you're on Sprint, and is using call forwarding codes that don't work on Ting. You probably also know that usually conditional call forwarding (busy, not answering) requires that your incoming calls get forwarded to an actual telephone number where your voicemail resides (in normal circumstances this is your phone number), but Youmail doesn't really let you see the number it's calling during setup so you can't do it manually. Youmail does, however, offer to issue you a number for a monthly charge. But thats no good. You're already obsessing over how much money you're saving on Ting- spending another 8 bucks a month for this service seems like a step in the wrong direction
But yet- even at the free level- there must be a phone number that Youmail issues you for this to work, right? And if you had this number, you could just set the whole thing up manually on the ting website. That would be so easy.
Well, there is a number-- and here's where to find it.
1) Get the app, download it to your phone, run the through the intro and skip the steps where it sets up call forwarding- they won't work.
2) log into your youmail account on a browser using your number and pin.
3) Look to the upper right corner of the site and you'll see your cell phone number. Click on that, and it will take you to "My Account"
4)Look the tabs on the left, choose "My Phones"
5) this will show your phone(s) and to the right of your phone you'll see a couple of options, one of which is "Need to activate this phone? " and below that is "show me how". click on that.
6) OK- we're here. In the center of the page you'll see a long number that starts with *28. Copy and paste the number EXCLUDING the *28. This is your call forwarding number. Mine was more than the usual amount of phone digits- I have no idea why or if you need all of them, but I copied them all.
7) Now, take this number and go to your "my devices" settings in Ting. Select your phone, turn on "call forwarding", and select "Forward Busy signal" and "Forward No answer" below, and in each case, paste the long number you copied from the youmail site. Save. Bam. Done.
Thats how I got it to work. Good luck.