Upgraded php from 5.6.30 to 7.0.32, civicrm still gives PHP out of date error
It depends on your hosting server.  It is usually possible to specify different PHP versions for command line (eg. php -v) and php that is used by your web server.  If you have no need for PHP 5.6 then I suggest you remove it and that trigger everything to use PHP 7.0.  Otherwise you'll need to look at your webserver/php configuration to make sure PHP 7.0 is selected as default.
Also, worth noting that PHP 7.0 is end of life soon, worth going to PHP 7.1 if available.