I don’t understand why you want to clear APN.If the APN you created is wrong, you can create a new one. If you use a private network APN, the requirements for APN are strict. The User_Name and Password of the APN you input must be exactly the same as the APN you applied for.But if you are using a public network APN, it does not matter if you input the wrong APN. The network will detect the APN you input. If it is wrong, the network will automatically assign a correct APN to the link to use.So you don’t have to worry, and you don’t need to clear the APN you set.
If you have any other questions, please keep in touch with me. Thank you!