In reply to The Lemming:
If it's one of the newer Crane branded ones it will be Bluetooth 4.0 aka Bluetooth Low Energy (BLE).
Provided your phone talks that it should pair no bothers. Could be worthwhile checking to see if it does.
Were you pairing it in the phones Bluetooth menu or to a monitoring app?
I got one for myself and one for the missus as they were on special for a fiver.
I also have a Wahoo Tickr Run which I mostly use. Once the Wahoo packs in I'll fall back to my Aldi one.
Would recommend the Wahoo one but it is spendy.
Quick edit. The Wahoo never dropped out and has been bang on into the 200's heart rate wise. The Aldi ones can sometimes drop alright. Then again they are a fraction of the price of the Wahoo. They also pair to the Satmap Active 12 where as the Wahoo crashed it.
Post edited at 22:10