It's less of a telco issue and more of a manufacturer issue. Yes, most phones have an FM receiver in them as part of the wifi+bluetooth chip. However, in most c

It's less of a telco issue and more of a manufacturer issue. Yes, most phones have an FM receiver in them as part of the wifi+bluetooth chip. However, in most cases the FM antenna pin of that chip isn't connected to anything, so it just won't work. The manufacturer would need to connect this pin to the headphone socket. Once that's done, the OS would need to support the FM radio. Some manufacturers bake this into their ROMs, others don't. Telcos are the last step, and might choose to strip the FM radio app out of the OS if they have a cozy relationship with the manufacturer.