Clone Phones are phones owned by all clones in Clone Club so they can keep in contact with each other without being traced. Every season the phones change due to various reasons. First it is changed because Felix is convinced that Sarah/Beth's pink phone was tapped by Dyad. The second time it changed was because Delphine had Sarah's number. Felix bought the second and third clone phones.
Season 1: Pink Nokia C2
In Season 1 the clones have Nokia C2's in pink cases. It is first seen in Episode 1 when Sarah steals Beth's bag and finds her two phones. In Episode 1 of Season 2, Sarah throws hers into water for security reasons.
Season 2: Green Nokia C2
In Season 2 after being convinced the pink phones were tapped. Felix gets rid of them and buys a fresh new set of phones and puts them in green cases. These phones last until Episode 2 of Season 3 until Felix gets rid of them because Delphine has their numbers.
Season 3: Blue iPhone 5C
Season 4: Purple iPhone
In Season 4, the new clone phones are now purple-cased iPhones.