Anyone who has watched a crime movie or the proliferation of CSI or similar shows in the last 15 years knows that any crim worth his/her salt has at least 2 phones and a couple of throw away ones as well, the gendarmes would surely know this. As Trevor indicated some people need to have two phones. The people concerned would have had friends in on the action maybe even the nasty type and they would not hesitate to plonk some big money on the horse. All betting outlets have to have records of bets laid. I do know one of those concerned and have found their attitude/behaviour regarding a racehorse to be above board in any communications. I would imagine the penalty would be harsh if found guilty.