How To Get Back Deleted WeChat Messages On iPhone?

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My best friend just deleted all wechat messages on her iPhone, and she was anxious to get back those deleted wechat messages. So is there any way? I cannot make sure whether she has an iTunes or iCloud backup for them. Any suggestions are welcomed. Thanks. iPhone 6, iOS 9 It is quite easy to delete some important data like wechat messages from iPhone without perception. Usually, data like wechat messages means a lot to us. Those mistakenly deleted wechat messages may be related to our bus...
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