Why does whatsmyip.org return a IPv4 address on phone and IPv6 on Surface?

When user checks the ip address using whatismyip.org using a cell phone browser (On Blackberry 10) they get an IPv4 address.
But when they check using their Surface, they get an IPv6 address.

Is this indicative of any networking problem?

They got same results from two different Wireless networks, each WLAN connected to a different cable modem/router.

Thanks.
computerlarryAsked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
No, it indicates what your networking supports.  I have Windows XP and Windows 7 on the same network here thru Comcast.  Win XP only support IPv4 but Win 7 supports IPv6 so even though they are going thru the same ISP, they report different IP addresses.  My Android phone thru the same network reports the IPv4 address.
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Craig BeckConnect With a Mentor Commented:
Dave is right.
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