携帯用リダイレクト設定

# for DoCoMo
BrowserMatch "DoCoMo" mobilephone
# for KDDI
BrowserMatch "KDDI" mobilephone
BrowserMatch "UP.Browser" mobilephone
# for SoftBank
BrowserMatch "J-PHONE" mobilephone
BrowserMatch "Vodafone" mobilephone
BrowserMatch "SoftBank" mobilephone
BrowserMatch "MOT" mobilephone
#RewriteRule ^/index.html$ http://www.sample.com/indexm.html env=mobilephone
#RewriteRule ^/$ http://www.sample.com/indexm.html env=mobilephone

RewriteCond %{ENV:mobilephone} .
RewriteRule ^/index.html$ http://www.sample.com/i/index.html [L,R]

RewriteCond %{ENV:mobilephone} .
RewriteRule ^/$ http://www.sample.com/i/index.html [L,R]

追記
#apachectl configtest で OK になるようですが
RewriteRule で env=mobilephone のような書き方はだめでした。