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I see one challenge with this. When a phone rings on a train everyone can determine where it came from. If these women are scared of making a scene or accusing the wrong person what would make them dial the number in the first place? Additionally what would the ring tone say that would shame the aggressor with no risk of embarrassing the women?

I think this is a great idea. Young people are more impressionable and more likely to change their minds about these issues. Together they could create a better future generation. The use of social media and blogs would be greatly helpful, that is the best way to get the attention of your target age span.

I think this is a great idea for an immediate reaction but it will not deter future attacks. The core of the violence issue isn't as much women not fighting back as it is the foundation that makes women a target. This issues cannot be resolved through acts such as this, they must go deeper to try and change the preconceived notions and cultural norms that allow for this behavior in the first place.
That being said women need something to help them feel safe now. I would recommend making anklets as well, you never know where an attacker will come from or what position you will be put in. Additionally, having two bracelets one on your wrist and one on your ankle will be helpful in situations with multiple aggressors. Unfortunately these situations are all to common.