iRule to redirect pool based on header and ignoring SNAT

Hello,

The first question I might ask is, which header field? Keep in mind that iRule is case insensitive .. So, you can try something like this adding it after the closure tag for the "when RULE_INIT":

when HTTP_REQUEST
{
	if ( tolower [HTTP::header <header_name>] contains "iphone" ) {
		snat none
		pool <Your_Destination_pool>
	}
}

Give it a try and inform me if it works with you.