Well the first review I read stated that it is not obvious what size sim to use or where it goes, found that is totally misleading information if you check the device properly these things are obvious and from the same review why blame the device because you have to be 18 to use facebook.. Had no problems at all with this device and very pleased I am with it the one thing I would advise is buy a unlocked device or buy an unlock code and do not use an EE sim check out GiffGaff cheaper data.
WD Ultra 2TB fits perfect in this case also handy for storing a heavy duty battery the type used to charge a tablet and or mobile device while out and about. Gives good protection all round, of course it will also store a hard drive of a lower capacity. Elasticated holding band stops anything stored from moving around in transit. Bottom line then does just what you need it to do.