How do I set up voice mail on my Huawei M835 mobile phone?
On most phones that don't have visual voicemail, holding down the 1 key on the keypad will take you to your voicemail. If you have voicemail active on your account, the first time you access it should bring you to a setup menu. Just follow the instructions.
However, if you hold down 1 and aren't taken to your voicemail, you will most likely have to call your carrier and either have them activate it for your account or tell you the number to dial for voicemail access.
Hoped this helped. If you need any more information, feel free to ask.