iPhone: SMS messages are not longer delivered
- Restart: Turn off your iPhone completely and then back on again. Small errors in the cache are deleted. You should also make sure that the flight mode is enabled.
- SIM card: Remove the SIM card with the SIM Tool or a straightened paper-clip. Wipe the contacts on the card gently and blow into the SIM Slot.
- Configuration: In General, the SIM card get the information to send SMS by itself. For the majority of mobile phone providers, you can request the addition of a configuration SMS, which establishes the right settings.
- Defective: Try to make a call with your iPhone. Also if this does not work the SIM card is a possible defect. For more help, contact your mobile service provider.

SMS is not from iPhone
iPhone with contract: SMS unlock
- You have bought your iPhone with a contract is tied to the Smartphone on the mobile service provider. Insert the SIM-card from another Provider, can lead to problems.
- The SMS sending must be activated in this case for other SIM cards. Vodafone customers call the *133#, Telekom customers *222#, O2 customers *125#. Then, the SMS will be activated shipping.
SMS is not delivered: the Provider down?
- The Problem is only in the last few minutes or hours, it can also be a failure of your mobile service provider. There are faults, can also be the SMS sending.
- Such a failure, you can usually do very little about it. Often there's only one: to Wait. For more information on the event of a power failure, see the following practice tips for Telekom, Vodafone, E-Plus and O2.

Telekom-down - no more texting
In the next practical tip we show you how to recover deleted SMS on iPhone to restore.
