A lone soldier (חַיָּל בּוֹדֵד, Ḥayal Boded) is a soldier in the IDF who does not have a support system in Israel, either because they do not have immediate family in Israel or they are estranged from their family in Israel. Lone soldiers serve in regular IDF units, including combat units, and receive special entitlements from the IDF, Israeli government ministries, and charity organizations, such as increased salaries, housing assistance, and additional leave.
In order to be eligible for a lone soldier status, none of your first-degree relatives can live in Israel.
You will receive a Lone soldier status only after your Tzav Rishon.
For more information about Lone soldiers, you can check those websites:
The Lone Soldier Center
FIDF
Mitgaisim-IDF
Nefesh B'Nefesh
Many programs provide housing for lone soldiers, you can learn more about some of them here:
Habayit Shel Benji
The Lone Soldier Center
Hamsa
Ha Bait Shel Lea
Beit Almog
Beit Eli
The Association for Israel's soldiers