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Considering this, what things have gallium in them?
Most Americans own some gallium. Its biggest use - more than half - is in integrated circuits as gallium arsenide or gallium nitride, and it ends up in cell phones (especially "smartphones"), computers, back-lit flat-panel devices and televisions. Gallium also helps make lasers and solar cells.
Secondly, is gallium safe to play with?
Pure gallium is not a harmful substance for humans to touch. It has been handled many times only for the simple pleasure of watching it melt by the heat emitted from a human hand. However, it is known to leave a stain on hands. Some gallium compounds can actually be very dangerous, however.
The primary use of gallium is in high speed semiconductors that are used to make mobile phones, optoelectronics, solar panels, and LEDs. Gallium is used to make the compounds gallium arsenide (GaAs) and gallium nitride (GaN) which are used to manufacture these devices.