Presently WICED SDK does not support modem(cellular).
Currently the code is written as running on top of a TCP/IP stack. In the case of the modem using AT commands this would require significant rewrite to map the code. Suggest that you find another implementation. If you want to use the implementation in the sdk you will have to implement the TCP layer to map to the modem AT commands. You can look at the simple TCP client or server sample apps first to get it working on top of your modem.