Do cell phones use IPv6?
Because all IPv4 addresses are now exhausted, IPv6 addressing is becoming the new standard. All providers (both ISP's & Cell Phone Providers) will eventually have to support it, however, there is currently no law or mandate on the books saying that they have to at present. I do know that if you use the wi-fi feature in your smart phone to connect to a router that has IPv6 support, your smart phone will try to acquire an IPv6 address, in addition to an IPv4 address. We call this the dual stacking mode, since your device acquires two IP addresses. One on IPv4 and one on IPv6. I've seen this personally myself on both the newer Comcast Xfinity provided router gateways and on the AT&T router gateways. My smart phone actually functions much better and faster when connected via the dual stacking mode since it can send out IP traffic on either of the two IP addresses. However, like I said above, because there is currently no law or mandate on the books yet saying that IPv6 connectivity is required, not every Internet Service Provider, Cell Phone Provider, website, or server that a website is hosted on has enabled IPv6 support yet. As of this posting, I do know that neither Frontier Communications nor Charter Spectrum has enabled IPv6 for their subscribers yet. All I can say is stay tuned and monitor your provider's technical support pages for it to roll out on their networks. If you own your own Internet router at home and it is an older model, you will need to check your router manufacture's technical support pages for a firmware update or purchase a new router. Same thing goes for either your cable modem or dsl modem. Because IPv6 will eventually happen thanks to ICANN. ICANN basically regulates everything having to do with the Internet. Or at least they did until I received the below update
As of October 2016, The U.S. Department of Commerce has transitioned IP Address management away from ICANN to the volunteer private sector in what's known as the IANA Stewardship Transition. Here is ICANN's statement. Thanks to User: John Curran for the update.