With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
Over 2G and 3G, voice calls are circuit switched. VoLTE and VoNR are packet switched, over IP, VoIP. Totally different. VoLTE is not as standardised as it may seem from the outside whereas 2G and 3G voice calls were.
Internet access is not regulated as an emergency service.
Does the 5g have the same problems or did they improved it . Because right now that may be a collosal problem if my country ever wanted to turn off 2g ( which to be fair likely wont happen for a long time ).