Bluetooth module compatible with both iOS and Android?

Hi

I need some advised on what bluetooth module I can use in my project which is compatible with both iOS and Andorid.
I currently have a HC-06 bluetooth module however I have since found out this is not usable with iOS for what ever reason.

I basically want to just use the bluetooth as a serial link between the arduino and smart phone.

Question: Are all BLE 4.0 modules iOS compatible and usable as a serial link?

Thanks

Horendus: not usable with iOS for what ever reason. Question: Are all BLE 4.0 modules iOS compatible and usable as a serial link?

I understand they are compatible but the next problem is doing something useful with it, which is an Apple problem, not Arduino. The same applies to the "whatever reason"