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Here is the sim900 Hardware design guide
mediafire.com/?u9leja2b800q96b
And here is the footprint in Orcad Layout (it's missing the keepout areas, you'll have to add them yourself)
mediafire.com/?7o11dmt9bodzd1q
Here is the footprint in Orcad PCB Editor (also missing the keepout ares)...
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