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  1. What are the components I need for assembling a hobby mobile phone?
  2. How would I go about assembling such a hobby device?
  3. Are there laws governing assembly/use of such hobby devices?
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  • \$\begingroup\$ As it stands this is far too broad. You might like to narrow your question to something specific and answerable. \$\endgroup\$ – David Mar 22 '14 at 14:50
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    \$\begingroup\$ There are people that dedicate their entire careers to mobile phones. \$\endgroup\$ – Matt Young Mar 22 '14 at 15:02
  • \$\begingroup\$ Mobile phones are intentional radiators. Yes, there are generally laws about selling and using radio transmitters wherever there are governments to pass them. \$\endgroup\$ – Spehro Pefhany Mar 22 '14 at 16:55
  • \$\begingroup\$ @David, thanks but my question has been answered already. \$\endgroup\$ – Tamad Lang Mar 24 '14 at 13:38
  • \$\begingroup\$ @MattYoung yeah. Nokia and T-Mobile have very nice devices around the market so I was hoping there are interfaces I can use. As it turned out in the answer below, I was right. \$\endgroup\$ – Tamad Lang Mar 24 '14 at 13:39
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Modern mobile phones are complex, highly integrated devices. I described what would be needed in a previous answer of mine to a similar question. Take a look at the schematic of the Neo FreeRunner phone to see what's involved.

For a very simple phone, you might be able to get away with a GSM module + some other electronics, as in the DIY Cellphone.

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