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 from Claro, if it is from Tigo you must communicate directly to their service line.

If it is Claro and it is active you can check the configuration manual in the following link, if on the contrary it is out of service you must change it for an active prepaid sim card and then insert it in the dataphone, please check the manuals in www.cxr.com.co/SAC