Yes! Spanish characters are supported and can be used in a text. The system is setup to support all the standard GSM characters shown below:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 : ; < = > ? ¡ ¿ ! " # ¤ % & ( ) ' * + , - . / Ä Ö Ñ Ü § ä ö ñ ü à @ £ $ ¥ è é ù ì ò Ç Ø ø Å å Δ _ Φ Γ Λ Ω Π Ψ Σ Θ Ξ Æ æ ß É
Including the Spanish characters: Éé Ññ and ¡.
Unfortunately, Áá Íí Óó Úú are non-GSM characters. This means using non-GSM characters ( ex: Áá Íí Óó Úú) will be treated as emojis and could result in additional message costs.