Home Français Changelog Contact Imprint & Privacy Protection


iPhone X

Since 1991 I use pda's and since 1994 mobile phones. Since 2005 I use a smartphone which combines both. After a >Palm Treo 650 I used an >iPhone 3GS, >iPhone 4, >iPhone 4s, >iPhone 5, >iPhone 5s, >iPhone 6, >iPhone X, >iPhone 12 Pro and since 2023 an >iPhone 15 Pro.

On this page I would like to talk about a few quirks and missing functions, as well as tips for the usage.


Profile Short Usage Sample Products
Advanced Audio Distribution
A2DP Audiotransfer Audioplayer, Headphones, Micro
The Advanced Audio Distribution Profile supports the transmission of stereo audio data between two devices, e.g. between a pc and a headset. There are two different roles within this profile - one unit is the source (A2DP-SRC) and the other one the sink (A2DP-SNK).
Audio Video Remote Control
AVRCP Audio/Video Remote Control PC, VCR, DVD-Player
The Audio Video Remote Control Profile enables mobile Bluetooth devices to act as a remote control for audio- or video devices. Instead of a simple remote control unit the controler may also be a pc, mobile phone or pda. There are two different roles within this profile - one unit is the controler (AVRCP-CT) and the other one the target (AVRCP-TG).

AVRCP support in the iPhone is limited to pause/play/stop prior to iOS 4.1
Hands Free
HFP In car telephony Phone, Hands free kit
The Hands Free Profile supports the use of a car kit. It manages the communication between a car kit and a mobile phone via Bluetooth. There are two roles in this profile. The car kit is called HF-Unit while the mobile phone is called HF-Audio Gateway.
HSP Headset voice output Headset
The Headset Profile supports the usage of wireless headsets, e.g. sound input and output for a mobile phone or VoIP calls with a computer. The possible quality is only sufficient for speech. For music the A2DP profile is used. There are two roles in this profile. The headset is called Headset-Headset while the opposite unit is called Headset-Audio Gateway. The Headset Proile uses services of the Serial Port Profile (SPP).
Human Interface Design
HID Inputs Keyboard, Mouse, PC
The Human Interface Device Profile supports the wireless use of input devices like mice, keyboards or joysticks. There are two roles in this profile. Input devices are called HID-Client and receivers as HID-Unit.

HID support was introduced to the iPhone in iOS 4.0.
Message Access Profile
MAP Message exchange between devices Phone, Car Kit
The Message Access Profile supports exchange of messages between devices. Mostly used for automotive use where an on-board device (typically a hands free car kit) can exchange messages with another device (typically a mobile phone).

MAP support was introduced to the iPhone in iOS 6.0.
Personal Area Networking
PAN Network connection Access Point
The Personal Area Networking Profile supports networks in personal areas. Through these ad-hoc networks up to eight devices can exchange data. Devices like harddisks, internet access or printers may be used like in local networks (lan). There are two different roles. A PAN-Access Point can provide a network access to other Bluetooth devices which are called PAN users or act as a master in a PAN group. This network can consist of up to seven PAN users via a PAN-AP. Two PAN users may otherwise connect directly with each other without a PAN-AP.
Phonebook Access Profile
PBAP read phonebook Phone, Car Kits
The Phonebook Access Profile supports read access to a mobile phone's phonebook for other devices.

The Bluetooth implementation in the iPhone is quite rudimentary and only supports the profiles mentioned above. Here you will find >Infos about all Bluetooth profiles.


The Calendar in the iPhones looks great at first sight but lacks some major features while using:

All of the above functions are supported by the app >Week Calendar.


The simple Notes app in the iPhone has only basic functions. As an alternative I use >Notebooks which adds a lot of features and syncs via WebDAV with the computer. There is also a macOS application for this.

SIM Lock/Netlock

To offer mobile phones at decent prices mobile service providers subsidize them and get their return on pricy contracts - Rockefeller did that before. To ensure the mobile phone earns its money it's protected with a SIM lock (works only with a SIM card from the mobile service provider) or netlock (works only in the mobile network of the provider). On the iPhone this protection is quite sophisticated and may only be deactivated by Apple on request of a mobile service provider. The removal is then processed at next syncronization with iTunes. In Germany this can be done e.g. after 24 months >online by Telekom. In the form one can also see when the removal can be done. Often iPhones are offered with a supposed Telekom netlock. If one wants to used that phone within the Telekom network with a discounted Congstar card one will be out of luck. Out of unknown reasons the card is accepted by the iPhone but the phone doesn't work. So it's de facto kind of a SIM lock.

Visual Voicemail

If one uses the iPhone with a mobile service provider supporting this feature one can use this comfortable notification of incoming messages called Visual Voicemail by Apple. Please have in mind that sometimes the provider has to know, an iPhone is used to enable this option. Important is hereby the provider and not the network.


A screenshot can be taken by holding the home button and clicking the on/off key at the same time. The produced JPEG picture is saved in Photos and transmitted at next sync.

Deactivating Touch ID

iPhone X deactivate Face ID Touch ID or Face ID can be quickly disabled since iOS 11 by pressing the power button and one of the volume buttons simultaneously until a screen with three sliders appears. This can be useful to prevent the forced unlocking by third parties. Alternatively, one can turn off the iPhone.

Emergency SOS

iPhone X Emergency SOSThe emergency call is activated by pressing the power button five times. A countdown counts from five to zero. Then the local emergency number is called. If one has stored emergency contacts on the iPhone, they will be automatically notified by text message including the current location after the emergency call. However, this can be deactivated.

Net monitor

The net monitor can be activated by entering ✱3001#12345#✱ (green handset).


Using the iPhone as a data modem via USB or Bluetooth is called Tethering by Apple. This may be activated since iOS 3.1.3 for unlocked iPhones.


The >iPhone 15 Pro supports 5G on many worldwide used frequencies (1/2/3/5/7/8/12/14/20/25/26/28/29/30/38/40/41/48/53/66/70/71/77/78/79/258/260/261). Learn more about >all 5G frequencies worldwide.


The >iPhone 15 Pro supports LTE on nearly all worldwide used frequencies (1/2/3/4/5/7/8/12/13/14/17/18/19/20/25/26/28/29/30/32/34/38/39/40/41/42/46/48/53/66/71). That wasn't always self-evident. E.g. the >iPhone 5 worked in Germany only within the Telekom network due to its supported frequency bands 1 (2100 MHz), 3 (1800 MHz) and 5 (850 MHz).

Learn more about >all LTE frequencies worldwide.


Since the >iPhone 6 and >iPhone 6 Plus VoLTE is supported. Thus the smartphone stays in the LTE network also for voice calls while older iPhones had to revert to 3G or 2G.>More information about VoLTE

Wirless Charging

Since the >iPhone 8, >iPhone 8 Plus and >iPhone X wireless charging is supported.
Find out more about >the used wireless charging standard Qi.

Activation Lock

iPhones may be secured with an activation lock. Without identifying with ones Apple ID it is impossible to deactivate "Search my iPhone" on the device, to logout of iCloud and to delete or activate the device. Thus a stolen iPhone is pretty useless for thieves.

Since iOS 8 the activation lock is activated by default. On iOS 7 one has to activate it.

Service & Support

The Service and Support coverage may be checked on the >Support-Homepage of the manufacturer with the devices serial number. this may be checked on an iPhone at Preferences > General > Info and on the Mac in the system report. Apple shows the following information:


Does iPhoto open each time the iPhone is connected? This may be switched off/on but it's not within the prefs of iPhoto or iTunes as one might expect but hidden in the program Digital Photos. Hidden is more or less literal as the function lies in the lower left corner behind the icon
with arrow up icon. Here one may choose if and which program opens when a device with pictures is attached. This may be a camera, drive or storage card.

SMS > England

If SMS to +447537410230, +447537410280 or +447537410200 appear on your cellphone's monthly bill these are caused by the iPhone sending them automatically at each activation and deactivation of Facetime or iMessage. There is a discreet note from Apple at the activation prompt about this behavior.


iPhone with error messageiPhone in recovery modeIf for example, you have entered an incorrect password too many times and ignored all warnings, the iPhone will only show at startup that it is disabled and you should disabled and that you should start iTunes. Starting with macOS Catalina, however, there is no iTunes at all, which is a bit irritating. To activate the recovery mode, simply open the Finder and connect the iPhone as directly as possible to the computer. For iPhones without a home button press the volume up button, then the volume down button and then press the standby button until the device restarts. Continue to hold down the standby button until the device is in recovery mode.


Apple offers diagnostic tools to detect defects on iPhones from iPhone 12 onwards. To use these tools, the iPhone must be switched off. Then the volume up and down buttons have to be pressed simultaneously, and the iPhone has to be connected to a charger. When the Apple symbol appears, the buttons can be released and the iPhone boots into a diagnostic mode. Now, Apple's >Diagnosis Tool can be opened in a browser on another device. Since Apple only offers this service in countries where they are legally obligated to support repairs, in other countries this requires a VPN-connection into a supported country (e.g. USA). Now, one can test the iPhone's hardware with various tests. This is useful in the event of defects or when buying used iPhones.


The model number of an iPhone tells you what kind of device it is. You can find it under Settings > General > About. The first letter of the model number means the following:


>Official Apple iPhone website


Back to main pageBack to main page