Hey there, and welcome to Apple Support Communities Ex_Brit,
We can certainly understand your concern and can help provide some insight. Just to clarify, do you have Visual Voicemail setup on your device? We ask this because it can be another route in accessing your voicemails. Check out these steps on how to setup and check your voicemails and see if that matches up on your side.
" Set up voicemail
The first time you tap Voicemail, you’re asked to create a voicemail password and record your voicemail greeting.
- Tap Voicemail, then tap Set Up Now.
- Create a voicemail password.
- Choose a greeting—Default or Custom; if you choose Custom, you can record a new greeting.
Play, share, or delete a voicemail message
Siri: Say something like: “Play the voicemail from Eliza.” Learn how to ask Siri.
Or do the following:
- Tap Voicemail, then tap a message.
- Do any of the following:
- Play the message: Tap
.- Messages are saved until you delete them or your carrier erases them.
- Share the message: Tap
.
- Delete the message: Tap
.- Important: In some countries or regions, deleted messages may be permanently erased by your carrier. Your voice messages may also be deleted if you change your SIM card.
To recover a deleted message, tap Deleted Messages, tap the message, then tap Undelete.
Check your messages when Visual Voicemail isn’t available
- On your iPhone: Tap Voicemail, then follow the instructions.
- On another phone: Dial your own mobile number, press * or # (depending on your carrier) to bypass your greeting, then enter your voicemail password. "
For additional information, check out this link: Check your voicemail on iPhone - Apple Support
Kindest regards!