ISO 11.2.5 has major bug
the single Telugu (one of the Indian language) message can crash the whole system of your iPhone. so everyone can easily exploit this bug through any communication application like whats app, messengers, mail and etc.. and make major damage to their victim iPhones. the affected phone would be like below picture. the above image shows the Telugu character, which is making the respective issue. now apple was released the new IOS on 20/02/2018. this IOS will be fixed above security issues so every IOS user should update the new IOS because you must prevent these kind of attacks.