Went through the exact same thing over the past week. I took my phone into one of my provider’s shops in person, months ago, to confirm whether it would survive the 3G shut-down without loss of service; they looked and told me it would be fine; and then a week ago I completely lost the ability to make calls or send text messages. (So nice of my provider to fail to provide their shop people with the information they’d need to actually help their customers.)
They spent months advertising the impending shut-down of their 3G network without ever – to my recollection – mentioning the term “VoLTE”, or otherwise suggesting that the thing you needed to stay connected post-“3G” was not “4G”. (Which might explain why the person in their own shop apparently didn’t know this either.)
Here’s an email conversation I had with my sister about three weeks ago, after she arrived back in the country:
Her: …also seriously any old mobiles you have lying around. Surely someone must have an old phone capable of “making calls”.
Me: Just for calls? Note: I think phones pretty much need to have 4G support now, so some old phones might not be useful. (Might depend on who the provider is, but mine is shutting down their 2/3G support later this month.)
Her: Yes that is the problem. Mum and dad’s old ones don’t support VoLTE. I have one old phone with me which should in that it’s not too old but is a known black hole in this area… and another which does support VoLTE but the SIM tray is broken so I can’t use it.
Me: I may be able to help, but I don’t know offhand what state it’s in, or if it’ll work with 4G. Or where it is! :). I shall endeavour to find these things out for the weekend.
Her: The problem isn’t 4G, which all the phones in this house support – it’s being provisioned for VoLTE.
Me: I don’t even know what that means.
Her: My hopes are now a little lower…
.
Me: I have learned that “The volte is a very small circle that is used in the training of a horse. Of all the circles, it requires the most balance from the horse.”
Her: Correct. I need a phone for niche horse training purposes.