Where can I find unreceived text messages on my mobile phone?

Is this a text message received while the phone was down? If so, you will not be able to receive it. If the text message is sent during a time when the phone is turned off or there is no signal, it will be automatically received the next time the phone is turned on or there is a signal. Also, if your mobile phone is a smart phone and you have installed the Caller app, then enter the Caller app and see if there are any unread text messages among the intercepted messages.