As an individual, you usually can't directly check whether someone has saved your number in their contact list. Most smartphones and messaging apps do not provide a feature that allows users to see if their number is saved in someone else's contacts.
However, there are a few indirect ways you might be able to make an educated guess:
Profile Picture or Display Name: If the person has set a custom profile picture or display name for your contact in their messaging app, it might indicate that they have your number saved in their contacts.
Message Indicators: Some messaging apps display special indicators when messages are received from contacts who are already saved in the user's contact list. For example, WhatsApp shows a profile picture and a "last seen" status for contacts in the user's list.
Ask Them: The simplest and most direct approach is to ask the person if they have your number saved in their contacts. It's a straightforward way to find out, and most people won't mind answering this question.
Check Delivery Receipts: If you send a text message or iMessage to the person, some messaging apps may show you a delivery receipt. If you see a "delivered" status, it means that the message was successfully delivered to the person's phone, which might suggest that your number is saved in their contacts. However, keep in mind that some users may have read receipts turned off, and this method is not foolproof.
Remember, respecting someone's privacy is important, and trying to figure out if they have your number saved can be seen as intrusive. If you're unsure or uncomfortable about it, it's best to respect their privacy and not worry too much about it.