Is there any evidence that terrorists are capable of constructing a device that plausibly looks like a cell phone but is a bomb? Have they ever done this in the

Is there any evidence that terrorists are capable of constructing a device that plausibly looks like a cell phone but is a bomb? Have they ever done this in the past? What about laptops? I do not think this is about security, so much as it is about punishing people who make it impossible for the relevant officials and spooks to snoop on the devices.