Most mobile communication operators provide call forward service. But few of them provide SMS/MMS forward. If you look for a solution to solve the problem, SMS Forwarder is the answer.
SMS Forwarder is application for mobile phones. The application can receive incoming SMS/MMS and send the message text content to other phone number as a new SMS. SMS Forwarder can put the information of original message sender in the new SMS.
For example, Bob has two phones (A and B). He runs SMS Forwarder on phone A and set the application to forward incoming SMS/MMS to phone B. Bob is outdoor with phone B. His friend, Alice, sends a sms "Hello!" to his phone A. SMS Forwarder Pro on phone A receives the sms and automatically sends out a sms "From 10000 Alice: Hello!" to phone B. (10000 is Alice's phone number.) Bob will never miss any sms. 

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