Question

I am using MFMessageComposeViewController to send text message via my App. But I have a problem when we remove the SIM and try to send message. Is there any delegate available to track whether the message will be sent / not?

Answer 1

You can use the CTTelephonyNetworkInfo class of the core telephony framework to gather information about the SIM card. Use the subscriberCellularProviderDidUpdateNotifier method to get notified about SIM card changes:

A block object that is dispatched on
the default priority global dispatch
queue when the user’s cellular
provider information changes. This
occurs, for example, if a user swaps
the device’s SIM card with one from
another provider, while your
application is running.