I need to manage my privacy

How do I best manage my data from being sold on my iPhone to manage my privacy . I am tired of all of the spam calls to my personal cell. I’m ready to change my number and phone. Please ***. I clear cache, history, etc. I’m getting killed with 30 marketing calls a day and 20 texts a day. Even if I block, Robinette calls back. My blocked call list and text hv least 50 calls a day and I’m not talking about email. I hv had to change my email address on gmail. I’m now using iCloud, but I need to unlink them I suppose?