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    <p>3G by itself seems tough to find. You can find out whether a device can <em>make calls</em> using <a href="http://blog.ddg.com/?p=24" rel="nofollow noreferrer"><code>[[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"tel://"]]</code></a>. You can check whether a device can get to the internet, period (and by which method that can <strong>currently</strong> happen) using <a href="http://blog.ddg.com/?p=24" rel="nofollow noreferrer">Reachability</a> code:</p> <pre><code>NetworkStatus currentStatus = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus]; if(currentStatus == kReachableViaWWAN) // 3G else if(currentStatus == kReachableViaWifi) // ...wifi else if(currentStatus == kNotReachable) // no connection currently possible </code></pre> <p>..but aside from that, I don't think you can check for the existence of a 3G modem in the device.***** If it can't make a call, and doesn't currently have cell data turned on and wifi turned <em>off</em>, you won't be able to find out if it's 3G-capable.</p> <p>An alternative way (not forward-compatible though, so you probably don't want to do this) is to compare the device's model with an exhaustive list, knowing which ones have 3G modems in them, as shown <a href="https://stackoverflow.com/a/3950748/244343">here</a>.</p> <p>***** As per bentech's answer, if you want to go digging around with device names (this may stop working with no advance warning if Apple decide to change the 3g interface name), call <code>getifaddrs</code> and check for the <code>pdp_ip0</code> interface.</p>
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    1. COI know everything you listed… The first two are just not acceptable : it's not because you can't phone or that you are currently on WiFi that you can't have cellular data. The third is not future proof...
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    2. COI'm very aware, which is why my answer is "no, there is no way to check just for 3G".
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    3. COYou should go with the third option, with the default being 'yes it has 3G' and then make updates as new devices come out. If the toggle won't do anything on a device without 3G, it's harmless for future devices to see it (and you'll still have some window of time to update before they could).
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