Inside iOS 26 - How to add free custom ringtones to your iPhone

The iOS 26 update doesn't make it easy to add custom ringtones, but with a few tools and some patience, you can still do it ...
CNET

iOS 26 Brings All These New Ringtones to Your iPhone

You can find all the new ringtones by going to Settings > Sounds & Haptics > Ringtone. There are seven total new ringtones, ...
IEEE

A Recursive Method to Encryption-Decryption-Based Distributed Set-Membership Filtering for Time-Varying Saturated Systems Over Sensor Networks

Abstract: Dear Editor, This letter deals with the distributed recursive set-membership filtering (DRSMF) issue for state-saturated systems under encryption-decryption mechanism. To guarantee the data ...