sim900 (n95dg) arduino mega ADK

hi
i have brought arduino mega adk , sim900 gsm module maplin.
i have tried example gsm_scanner test if module working. gsm module seems work fine network light flashing every often, module not communicating arduino board "gsm networks scanner"

i have powered 12v power supply able supply 2 amps.

the issue have, dont know connect serial
i have bent pin 2 , connected pin pin 10 have read here:

 https://www.arduino.cc/en/guide/gsmshieldleonardomega
but has not worked me,

i have set jumpers software serial , connected software serial pins mega adk pins 18,19 has not worked me.

thank in advance if can help

the thing stands out 12v supply.

the maplin / linksprite gsm shield specifies 5v input.


while cannot find exact schematic board , regulators there chance may have damaged it.

also 12v maximum ideal should feed mega if intend that, 9v better onboard regulator not overheat.

have checked psu giiving out true 12dc , many cheap wall plugs give out higher.

have got sim 900 shield run on uno, have standard mega not tried yet, try unos software later.

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