Thanks for the explanation. It does indeed sound like there’s no convenient solution till your whole system gets revamped. To briefly explain *why* I don’t want your voicemail enabled: I use my USMobile number as a forwarding line for Google Voice. Google Voice’s voicemail is frankly superior to yours so I want to use it exclusively. When your voicemail kicks in it interferes with Google Voice’s operation, causing me frustration and a real mess. I’ll give some thought to whether I want to be bothered with going through a quarterly exercise of calling and re-disabling your voicemail.
Most phones don’t make that as easy as it ought to be. Apple’s iPhone will back up voicemails to your computer along with everything else, but they’re stored in a funky file format that’s not easily played by most software. Most Android phones, meanwhile, store your voicemails on off-site servers.

A voicemail greeting can be pivotal in attracting a potential customer to your company or repelling him! So, it may be worthwhile to utilize some tried and tested tips to frame voicemail greetings for your company. The first line must include a brief description of your company and the services it offers clearly. Tell the callers the time frame within which they will get a call from your end. Ensure the voice used in recording the greeting is cheerful and not drab one. Ensure the greeting is recorded not in a hurried manner so that the callers can understand each word without issues. Try keeping the voicemail message length to 20 seconds or so.
If you want to re-enable the Voicemail service on your Android device, then you can easily do that from your phone settings. I hope this guide will help you in deleting your old Voicemail greetings and record the new ones for the callers.