Here's The Secret iPhone Codes That Apple Have Been Hiding From You.

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Technology

2 All you have to do is dial *#5005*7672# and then the "call" button.

2All you have to do is dial *#5005*7672# and then the
You can see where exactly your text messages are being routed before they get to your intended recipient.

#1 You can also block calls.

#1You can also block calls.

It is not free of cost though, but this is a service that most of us would definitely like to pay for.

With these codes you can block incoming and outgoing calls. To enable call barring dial *33*PIN# and to disable it dial #33*PIN#.
Dial *#43# and "call" to know the status of your call waiting. To turn it on, dial *43# and "call", and to turn it off, dial #43# and "call."
You can see where you're forwarding your call by entering *#21#