You have just added a character outside the GSM standard, which means that if you choose to keep it, you also accept that your message is now treated as a Unicode message, which means that there will be fewer characters for each SMS/SMS part.
Character outside the GSM standard
You have just added a character outside the GSM standard, which means that if you choose to keep it, you also accept that your message is now treated as a Unicode message, which means that there will be fewer characters for each SMS/SMS part. And as you have exceeded the allowed limit, the excess text will be automatically removed.