Sync contacts between Apple iPhone and countless other apps

iPhone is a Smartphone model line that has been in life since 2007 with the release of the product namesake iPhone. The phone series, which is manufactured by Apple, offers car style dashboard capabilities as well as GPS navigation service and was inspired by Steve Jobs' visit to Xerox PARC in 1979. Since it's conception, there have been 12 different models released throughout the years including significant updates each year. iPhones also offer voice recognition and touch screen features such as an application store for downloading email programs and games alike.
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Sync contacts between Apple iPhone and other apps like:

AGFEO
AGFEOtel
Alcatel-Lucent Rainbow Office
ALL-INKL
Android
ansitel
API
Apple iCloud
Apple iOS
Apple iPhone
Apple macOS
Apple OSX
Asterisk
Atmail
AVM FRITZ!Box
Baikal
blau direkt
Box
CardDAV
CloudYa
corpoTel
CSV
DATEV
Deutsche Telefon Tk-Anlage CentrexX
Directory for Google Workspace, Cloud Identity and Essentials
DocBee
facilioo
fruux
Gigaset
Google Contacts
Google GMail
Google Nexus
Google Pixel
GSuite
HubSpot
IMMOWARE24
INOPLA
KBMpro
Kerio Connect
LDAP
Microsoft 365
Microsoft 365 Shared Mailbox
Microsoft Active Directory
Microsoft Dynamics 365
Microsoft Exchange
Microsoft Exchange Web Services (EWS)
Microsoft Global Address List (GAL)
Microsoft Graph API
Microsoft Office 365
Microsoft Outlook
Microsoft SQL Server
Microsoft Teams
MOCO
Mozilla Thunderbird
MyCRM
MySQL
Nextcloud
NFON
o2 digital phone
ownCloud
Pascom
Personio
PhoneSuite
Pipedrive
Placetel
Plusnet
Radicale
RingCentral
salesforce
simplr
Sipgate
snom
STARFACE
SugarCRM
SWYX
TANSS
Telekom NetPhone
UCware
Unify
weclapp
XELION
Yealink
Zendesk
Zoho