I'm sure somebody will put out a 6.5" smartphone soon enough.
Looks like someone already did.
6.95 inches -Posh Equal Pro LTE L700
http://www.gsmarena.com/posh_equal_pro_lte_l700-8174.php
6.4 inches - Sony Xperia Z Ultra:
http://www.gsmarena.com/sony_xperia_z_ultra-5540.php
6.44 inches - Xiaomi Mi Max (doesn't have Metro bands though:
http://www.gsmarena.com/xiaomi_mi_max-8057.php
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