How to build modem for only send and receive the msg

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potetojb

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hello

i want to build the modem for only send and receive msg.. and the modem can connet to microcontroller and the vb.

can some one help me..

i my country the modem is very expensive..

if i build the modem i can save my money..

Added after 1 minutes:

if my idea crazy please tell me..

hope someone can help me.
 

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