The German telecommunications portal “teltarif.de” indicated that modern smartphones no longer include an external memory card slot, and even if a second slot is available, it is intended for a second SIM card or an external memory card, of course not. You can use the two together at the same time.
The German portal advises the user who faces storage problems to rely on external storage units, explaining that the external units include all types of memory, which comes in the form of hard disks, solid state disks (SSD), flash memory units or reading devices, that are connected to the smartphone. Via Micro-USB, USB-C, or Lightning ports.
The user needs an adapter if he is unable to connect the memory unit to the smartphone directly, and the memory unit connected to the smartphone often appears in the file manager application under the name External Storage.
Cloud storage
The German portal added that external storage also means the possibility of using cloud storage services on the web, and this solution is more practical in most cases;
Since smart phones contain storage media that cannot be practically transferred, the exception is interconnection solutions such as hard drives or memory card readers connected to the "Wi-Fi" network.
And there is a cloud memory with a specific storage capacity in almost all smart phones and e-mail accounts, and the user can get more storage capacity for additional costs without any problems, and there are many cloud storage services on the web.
The user who is concerned with the issue of privacy and data protection must choose services in which the "server" (web server) is located in the European Union countries, or set up his web memory on a private or rented server, and in this case it is possible to rely on free and open source file hosting solutions Such as "Owncloud" or "Nextcloud", and the user can access his web memory through applications that work easily on all operating systems.