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<p>To understand what makes messaging secure or insecure, it helps to first understand how messages are sent from one mobile to another. <br /><br />It starts with your mobile phone communicating with the mobile and internet infrastructure.</p>
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<div class="page-banner"><div class="alert alert-warning"><span class="icon icon-alert fa fa fa-warning" aria-hidden="true"></span><div class="message-content">How Mobile Communication Works is only accessible to enrolled learners. Sign in or register, and enroll in this course to view it.</div></div></div>
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<p style="text-align: center;"><em>Credit: <a href="https://myshadow.org/ckeditor_assets/attachments/265/en_howtheinternetworks.pdf" target="_blank"> How the Internet Works - My Shadow (PDF)</a> from <a href="https://tacticaltech.org" target="_blank"> Tactical Technology Collective</a></em></p>
<p></p>
<p>Not sure about some of the terms? Download this glossary: <a href="/assets/courseware/v1/64a6b51b4a6795484685bf8d24820b68/asset-v1:Totem+TP_SM_001+course+type@asset+block/HTIW_-_Glossary_en.pdf" target="_blank"> HTIW - Glossary en.pdf</a></p>
<p>Your phone is smart and can connect to the infrastructure in multiple ways; messages can be sent over GSM, Wi-Fi, or 3G/4G/LTE/GPRS. <br /><br />What’s the difference between these?</p>
<blockquote>
<ul>
<li>Text messages (SMS) travel over the <strong>GSM infrastructure</strong> (1). This is also used for regular calls, and is provided by your Telecom provider</li>
<li>Apps like Whatsapp, Signal, Wire, WeChat and iMessage travel over the internet:</li>
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<li>When it comes to mobile phones, you can connect to the internet via <strong>Wifi</strong> (2) - say, when you are connected to the Wi-Fi connection at home or at work</li>
<li>Or via <strong>3G/4G/LTE/GPRS</strong> (3). This second type of Wi-Fi connection is made via mobile phone towers, and it’s what your phone’s data plan is for.</li>
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<p>Now that you have an idea about how your phone connects to the infrastructure, the question becomes: what is your phone actually communicating to the infrastructure? And then, what can someone who has access to the infrastructure know about you?</p>
<p>A member of the Green Party of Switzerland had similar questions; so he requested and then analysed six months of his phone data. Watch this 4-minute animation about the “Life of Balthasar Glättli” (it's without sound) to get a sense of what can be learned about a person's life just from his phone data.</p>
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<p style="text-align: center;"><em>Credit: <a href="https://myshadow.org/resources/life-of-balthasar-glattli" target="_blank">Life of Balthasar Glättli</a> from <a href="https://vimeo.com/tacticaltech" target="_blank">Tactical Technology Collective</a></em></p>
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