<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>userbinator</author><text>The actual &amp;quot;phone&amp;quot; part is what&amp;#x27;s difficult about doing this, and I&amp;#x27;d be &lt;i&gt;very&lt;/i&gt; impressed if someone did manage to write a full GSM stack and produce working --- if not completely legal due to all the regulations --- hardware themselves (I believe Fabrice Bellard has done something similar), but then again, most of the large manufacturers don&amp;#x27;t design and produce the GSM hardware in mass-produced phones either. As this project shows, taking an existing GSM modem and building an interface around it is not very difficult in comparison.&lt;p&gt;A comparison with a mass-produced product of similar functionality 3 years ago yields some interesting datapoints:&lt;p&gt;&lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.bunniestudios.com&amp;#x2F;blog&amp;#x2F;?page_id=3107&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.bunniestudios.com&amp;#x2F;blog&amp;#x2F;?page_id=3107&lt;/a&gt;</text><parent_chain></parent_chain></comment><story><title>My open-source, do-it-yourself cellphone (2013)</title><url>https://blog.arduino.cc/2013/08/12/diy-cellphone/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>StavrosK</author><text>This is great! Here&amp;#x27;s my (more retro) take on it:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.stavros.io&amp;#x2F;posts&amp;#x2F;irotary-saga&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.stavros.io&amp;#x2F;posts&amp;#x2F;irotary-saga&amp;#x2F;&lt;/a&gt;&lt;p&gt;I&amp;#x27;m looking to make a PCB for it, as the Arduino Uno + shield is way, way too big for this. Does anyone know of a good way to do that? I looked at the SIM900 module but I was a bit intimidated by all the pins.&lt;p&gt;The OP&amp;#x27;s build seems to be using the Quectel M10, maybe it won&amp;#x27;t be too hard to get that running...</text><parent_chain></parent_chain></comment><story><title>My open-source, do-it-yourself cellphone (2013)</title><url>https://blog.arduino.cc/2013/08/12/diy-cellphone/</url></story>