Can Iphone share my phone number without me knowing?

Hello GabyLestrange,

For help with spam calls and texts, there are several steps you can take that should help reduce them. First, to answer your direct question about if your iPhone would share your number without your knowledge, the answer is no. You may also need to speak with your cellular provider about your phone number if it is a new one for you.

On your iPhone, you can detect and block spam phone calls. Use these steps: Detect and block spam phone calls

To turn on Silence Unknown Callers, go to Settings > Phone, then scroll down, tap Silence Unknown Callers, and turn on the feature. Calls from unknown numbers are silenced and sent to your voicemail, and appear in your recent calls list.

There are additional steps in that article as well we'd recommend you look at. Also, for spam text messages, use the guidance here to block, filter, and report them: Block, filter, and report messages on iPhone

All the best.