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Some Siemens produced mobile phones suffer from a vulnerability in their handling of SMS messages. If a maliciously formed SMS message contains certain unusual characters, the mobile phone will be unable to display or delete this message. If enough messages are sent, SMS functionality may be completely denied.
Read more at www.xatrix.org
This is why you shouldn't allow (as a programmer) characters outside the ascii norm.
Like for standard english, 0-9, a-z, A-Z . ? ! are the usual for "normal" conversation. Yes, I'm already aware that there are many more forms of "communication" yet this is something they could've prevented. At least, however, it's not like MS and their "null" problem.