blocks|key|1314802|text|根据[CTCarrier+carrierName]的documentation|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1314803|1314804|如果您为运营商配置了设备，然后移除了SIM卡，此属性将保留运营商的名称。|blockquote|1314805|1314806|1314807|据我所知，您无法检测是否安装了SIM卡。您只能使用Reachability确定无线广域网连接是否可用。|1314808|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/ios/DOCUMENTATION/NetworkingInternet/Reference/CTCarrier/Reference/Reference.html#//apple_ref/doc/uid/TP40009596-CH1-SW1|1|http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html^0|2|N|Q|D|0|0|0|0|0|0|P|C|P|C|1|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]]|E|$]]|$1|F|3|-4|5|6|7|13|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|14|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|15|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|N|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]|V|$5|Q|R|S|E|$T|W]]]]

According to the <a href="http://developer.apple.com/library/ios/DOCUMENTATION/NetworkingInternet/Reference/CTCarrier/Reference/Reference.html#//apple_ref/doc/uid/TP40009596-CH1-SW1">documentation</a> for <code>[CTCarrier carrierName]</code>:

<blockquote>
 If you configure a device for a carrier and then remove the SIM card,
 this property retains the name of the carrier.
</blockquote>

As far as I know, you cannot detect if the SIM card is installed. You can only determine if a WWAN connection is available using <a href="http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html"><code>Reachability</code></a>.

blocks|key|2164104|text|@import+CoreTelephony;

-(BOOL)hasCellularCoverage
{
++++CTTelephonyNetworkInfo+*networkInfo+=+[CTTelephonyNetworkInfo+new];
++++CTCarrier+*carrier+=+[networkInfo+subscriberCellularProvider];


++++if+(!carrier.isoCountryCode)+{
++++++++NSLog(@"No+sim+present+Or+No+cellular+coverage+or+phone+is+on+airplane+mode.");
++++++++return+NO;
++++}
++++return+YES;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2164105|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>@import CoreTelephony;

-(BOOL)hasCellularCoverage
{
 CTTelephonyNetworkInfo *networkInfo = [CTTelephonyNetworkInfo new];
 CTCarrier *carrier = [networkInfo subscriberCellularProvider];


 if (!carrier.isoCountryCode) {
 NSLog(@"No sim present Or No cellular coverage or phone is on airplane mode.");
 return NO;
 }
 return YES;
}
</code></pre>

blocks|key|2164094|text|CTCarrier对象有5个属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2164095|allowsVOIP
carrierName
isoCountryCode
mobileCountryCode
mobileNetworkCode|code-block|syntax|javascript|2164096|我做了一些关于CTCarrier的测试，我得出的结论是，对于iOS+7，当SIM卡被移除时，只有carrierName和allowsVOIP被保留。isoCountryCode、mobileCountryCode和mobileNetworkCode都为iOS+7进行了重置。这就是你检测SIM卡是否存在的方法。|style|BOLD|2164097|对于iOS+6，所有值都将保留。|2164098|我使用的是运行iOS+7的iPhone+4S和iPhone+5进行测试。|2164099|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/IOS/documentation/NetworkingInternet/Reference/CTCarrier/Reference/Reference.html^0|0|9|0|0|0|Z|12|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@$A|14|B|15|K|L]]|9|@]|C|$]]|$1|M|3|N|5|6|7|16|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

The <a href="https://developer.apple.com/library/IOS/documentation/NetworkingInternet/Reference/CTCarrier/Reference/Reference.html" rel="noreferrer">CTCarrier</a> object has 5 properties:

<pre><code>allowsVOIP
carrierName
isoCountryCode
mobileCountryCode
mobileNetworkCode
</code></pre>

I have made some tests regarding CTCarrier and I have come to the conclusion that for iOS 7 only carrierName and allowsVOIP are retained when SIM is removed. isoCountryCode, mobileCountryCode and mobileNetworkCode are reset for iOS 7. That's how you can detect if a SIM is present or not.

For iOS 6 all the values are retained.

I performed the tests using an iPhone 4S and iPhone 5 both running iOS 7.

blocks|key|1314858|text|Swift版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1314859|func+hasCellularCoverage()+->+Bool+{

++++let+networkInfo+=+CTTelephonyNetworkInfo()

++++guard+let+info+=+networkInfo.subscriberCellularProvider+else+{return+false}

++++if+let+carrier+=+info.isoCountryCode+{
++++++++print("No+sim+present+Or+No+cellular+coverage+or+phone+is+on+airplane+mode.+Carrier+=+\(carrier)");
++++++++return+false
++++}

++++return+true

}|code-block|syntax|javascript|1314860|或|1314861|func+hasCellularCoverage()+->+Bool+{

++++let+networkInfo+=+CTTelephonyNetworkInfo()

++++guard+let+info+=+networkInfo.subscriberCellularProvider+else+{return+false}

++++return+info.isoCountryCode+!=+nil+?+false+:+true

}|1314862|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift version:

<pre><code>func hasCellularCoverage() -&gt; Bool {

 let networkInfo = CTTelephonyNetworkInfo()

 guard let info = networkInfo.subscriberCellularProvider else {return false}

 if let carrier = info.isoCountryCode {
 print("No sim present Or No cellular coverage or phone is on airplane mode. Carrier = \(carrier)");
 return false
 }

 return true

}
</code></pre>

or 

<pre><code>func hasCellularCoverage() -&gt; Bool {

 let networkInfo = CTTelephonyNetworkInfo()

 guard let info = networkInfo.subscriberCellularProvider else {return false}

 return info.isoCountryCode != nil ? false : true

}
</code></pre>

blocks|key|2330599|text|希望这能有所帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2330600|++++if+#available(iOS+12.0,+*)+{
++++++++return+CTTelephonyNetworkInfo().serviceSubscriberCellularProviders?.first?.value.mobileNetworkCode+!=+nil
++++}+else+{
++++++++if+let+_+=+CTTelephonyNetworkInfo().subscriberCellularProvider?.isoCountryCode+{
++++++++++++return+true
++++++++}+else+{
++++++++++++return+false
++++++++}
++++}|code-block|syntax|javascript|2330601|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

hope this helps：
<pre><code> if #available(iOS 12.0, *) {
 return CTTelephonyNetworkInfo().serviceSubscriberCellularProviders?.first?.value.mobileNetworkCode != nil
 } else {
 if let _ = CTTelephonyNetworkInfo().subscriberCellularProvider?.isoCountryCode {
 return true
 } else {
 return false
 }
 }
</code></pre>

blocks|key|526198|text|Swift+5.4应答|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|526199|接受的答案已过期或不正确。|526200|protocol+SimCardServiceProtocol+{
++++var+isAvailableSIM:+Bool+{+get+}
}

final+class+SimCardService:+SimCardServiceProtocol+{

++++var+isAvailableSIM:+Bool+{
++++++++return+CTTelephonyNetworkInfo().serviceSubscriberCellularProviders?.first?.value.mobileNetworkCode+!=+nil
++++}
}|code-block|syntax|javascript|526201|entityMap^0|0|B|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Swift 5.4 answer
Accepted answer is outdated or incorrect.
<pre><code>protocol SimCardServiceProtocol {
 var isAvailableSIM: Bool { get }
}

final class SimCardService: SimCardServiceProtocol {

 var isAvailableSIM: Bool {
 return CTTelephonyNetworkInfo().serviceSubscriberCellularProviders?.first?.value.mobileNetworkCode != nil
 }
}
</code></pre>

I am using the answer in this topic. <a href="https://stackoverflow.com/questions/8161235/iphone-how-to-determine-carrier-of-the-device-att-verizon-etc/8161253#8161253">iPhone - how to determine carrier of the device (AT&amp;T, Verizon, etc?)</a> which is the same as <a href="https://stackoverflow.com/questions/5204121/getting-operator-details-in-iphone">getting operator details in iphone</a>. Although it works fine when using a sim card, the returned carrier name if there is no SIM card is the old carrier name. It doesn't detect that the SIM is removed.

I know this contradicts with Apple documentation that if there is no carrier, CTCarrier object shall be nil. But in my app I logged the carrier info and it gives me the latest carrier name although no sim is installed.

iPhone - Detecting SIM card availability

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在这个主题中使用答案。与相同的。虽然在使用SIM卡时工作正常，但如果没有SIM卡，则返回的运营商名称是旧运营商名称。它不会检测到SIM卡是否被移除。我知道这与苹果的文档相矛盾，如果没有运营商，CTCarrier对象应该为零。但在我的应用程序中，我记录了运营商信息，它给了我最新的运营商名称，尽管没有安装sim。

问iPhone -检测SIM卡可用性
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回答 6

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