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We introduce MobiCeal, the first practical Plausibly Deniable Encryption (PDE) system for mobile devices that can defend against strong coercive multi-snapshot adversaries, who may examine the storage medium of a user’s mobile device at different points of time and force the user to decrypt data. MobiCeal relies on “dummy write” to obfuscate the differences between multiple snapshots of storage medium due to data encryption. By combining a tweaked thin provisioning with block- level encryption, MobiCeal supports a broad deployment of any block-based file systems on mobile devices. More importantly, MobiCeal is secure against side channel attacks which pose a serious threat to existing PDE schemes. A new fast switching mechanism is also introduced in MobiCeal to help users switch from the public mode to the hidden mode within 10 seconds. It is shown that the performance of MobiCeal is significantly better than prior PDE systems against multi-snapshot adversaries.