Telephone How do I stop callers from leaving voicemail messages on my mobile phone if I miss a text relay call? Your network provider can switch off voicemail on request. There is information about this on the main networks’ web pages here: EE O2 Three Vodafone Related Questions How do I complain about my telephone provider? How do I get my mobile phone unlocked? How do I keep my mobile phone number when switching provider? How do I check mobile phone coverage in my area? What is the process for changing mobile provider?