A common standard format for exporting

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Older phones and some modern ones still offer the option to back up contacts directly to the device's internal storage, an SD card, or a SIM card.
VCF (vCard) Files: and importing contacts. A single .vcf file can contain multiple contacts.
CSV Files: Contacts can often be exported to CSV (Comma Separated Values) format, which is easily editable in spreadsheets.
Limitations: Manual process, risk of data loss if the device is damaged, and not suitable for real-time synchronization.
SIM Card Storage (Limited):

While modern smartphones primarily store contacts in phone memory or sync turkey phone number list with the cloud, SIM cards retain the capability to store a very limited number of contacts (typically 200-250) with only basic information (name and one number). This is a legacy feature, useful for very basic phones or emergency backups, but generally not recommended for primary storage.
Backup Frequency:

Cloud synchronization typically happens continuously or at frequent intervals, ensuring backups are always up-to-date.
Local backups require manual initiation.