You must verify that the sim is still active, you can validate this by testing it on a cell phone and dialing *611 if the sim card is Claro, if it is Tigo you must contact their service line directly.
In case it is clear and is active you can consult the configuration manual in the following link, if on the contrary it is out of service you must make the change for an active prepaid sim and then insert it in the dataphone, please consult the manuals at www.cxr.com.co/SAC