Unsure of which BoobiTrap fits your needs and your phone? Generally, next-generation phones like the Samsung Galaxy series, the iPhone 5 and 6, and the Motorola Moto X and Turbo fit the BoobiTrap Plus much better
Smaller phones, such as basic pay-as-you-go or older iPhone 4's fit well in the original BoobiTrap.
Above you'll see a BoobiTrap next to BoobiTrap Plus.
Here is a BoobiTrap Plus with an iPhone 6 and a Samsung S4.
Here is an original BoobiTrap with an iPhone 4 and an HTC.