Company phones should not be used except for company interests, and the mobile phone and its credit are a trust held by the employee, so he should not use it except with permission, because of the general meaning of the verse (interpretation of the meaning):
Reference from Holy Quran
“O you who have believed, do not consume one another's wealth unjustly but only [in lawful] business by mutual consent” [an-Nisa’ 4:29].
Hadith
And the Prophet (blessings and peace of Allah be upon him) said: “Your blood, your wealth and your honour are sacred to you, as sacred as this day of yours, in this month of yours, in this land of yours. Let those who are present convey it to those who are absent.” Narrated by al-Bukhaari (67) and Muslim (1679).
Hadith
And he (blessings and peace of Allah be upon him) said: “It is not permissible to take a person’s property unless he gives it willingly.” Narrated by Ahmad (20127); classed as saheeh by al-Albaani in Irwa’ al-Ghaleel (1459).
Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: The basic principle in our view concerning this matter is that if someone takes any person’s property for a specific purpose, then he should not dispose of it for any other purpose except after asking their permission. End quote from al-Liqa’ ash-Sharhi (4/9).
Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said
Using government property that may be in the office for personal matters is haraam, because it is contrary to the trust that Allah has enjoined us to uphold.
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That applies except in cases where what you do will not cause any harm, such as using a ruler, because that does not affect anything or do any harm. As for using pens, paper and cameras, using them for personal matters when they belong to the government is not permissible.
End quote from Fataawa Islamiyyah (4/306).
Avoid wastage:
With regard to extra phone credit that is surplus to company needs, or free phone credit, if it will be cancelled after that and no one will make use of it in the interests of the company, then what appears to be the case is that the employee’s making use of it is better than it being wasted without any benefit or compensation that could benefit the company.
The Prophet (blessings and peace of Allah be upon him) forbade wasting money, and the additional credit that is not needed for company interests, and that the company has no plans to make use of, will be wasted.
Permission of owner
It is not permissible for the employee or worker to use equipment or other things belonging to the company or the management for personal purposes, because that is a transgression against the rights of others, without their permission. The Prophet (blessings and peace of Allah be upon him) said: “It is not permissible to take the property of a Muslim unless he gives it willingly.”
Trash:
If there are things that are going to be thrown in the trash, then there is nothing wrong with taking them, because the owners have abandoned them.
Reference: islamqa.en/info
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