How about 3G/4G service? Do you know if that is more secure?
3G can be cracked and has been (less than 2 hours processing time) already. I don’t know about 4G but unless they increase the cypher strength it would suffer the same fate very quickly. It comes down to making a cypher complex enough that time to decode is what makes it prohibitive to break. Information becomes pretty useless if it take years to break into.