Today two tweaks were released for those who are afraid of restart iPhone with a text message, the problem affecting almost all applications installed in terminals. Apple has acknowledged the bug which is at the root of the problem and has promised to release an iOS update that will fix it, but we don't know yet if iOS 8.3.1 or a future update will be available to reassure users, and also we don't know when it will be released.
For those who jailbreak and who want a very quick solution to the problem, starting today in Cydia there are two tweaks called IneffectivePower and UnicodeSuppressor, they fix the existing bug in iOS 8. The second of them can be downloaded available here, and the installation can be done with iFile, or whatever you want, it only solves the problem of the Messages application, so not the entire operating system.
IneffectivePower is still the tweak you should install, it solves the problem by modifying CoreText in the entire operating system, so you will benefit from the possibility of using any kind of applications without problems. This tweak can be installed from the http://cydia.angelxwind.net repo, which you will have to add to Cydia, and after installation no one will be able to block your terminal.
Having said that, now you can be safe, but unfortunately those without jailbreak can only benefit from the prevention described by me here.
