If you have T-Mobile, I recommend logging into your account and going to Profile > Privacy and Notifications > Advertising & Insights and disabling everything. Obviously, as a consumer I don't know exactly how this data is being collected, but if the the carriers are sharing individual level data, this is hopefully the opt-out.

EDIT: This is the text from one of the settings: With your consent, T-Mobile, affiliates, and ad providers use your web browsing and app usage data along with advertising identifiers to deliver relevant mobile advertising and to learn more about your preferences. Advertising identifiers used can include Android and iOS Advertising IDs, browser mobile cookies, and device identifiers.