While it is not a proper judgment of iOS system in general it may be that sending an SMS to other phones , especially if they belong to another operator , the receiver receives the message with errors or strange signs.
There is a fix for this, only solutions we can try to put to prevent recurrence.
. 1 - Try to send simple messages , ie less than 160 characters. From that number of characters the system splits the message into two parts and sends them , but it can happen that the operator of another user code correctly accept a message in two parts .
2 - . Evita letters with accents , seems a joke, but some operators may not work well with words with accents because software - mobile network management systems , which causes many failures den
. 3 - Avoid non-ASCII symbols , those symbols that are not standard in your language , or the less common ( ç , ï , etc . )
. 4 - Avoid using Emoji icons or emoticons . Not all operators are able to correctly interpret and prone to failure .
To find the number of characters that are writing you can go to Settings - > Messages -> Count Characters