variable variables in sh or dash

variable variables in sh or dash

The following code executes fine on bash.
sms="SMSFile"
email="EmailSubj"
for x in sms email; do echo variable \$$x=${!x}; done;
Output is
variable $sms=SMSFile
variable $email=EmailSubj
But I need to write it in sh NOT bash. if I execute same command in sh it
gives me error
sh: 3: Bad substitution
This is due to ${!x}. I looked up the manual of sh which does not state
anything about such parameter expansion. So sh does not support it I
believe. If not how can use variable variables in sh