In most cases, the funds are available immediately or within a few hours of the deposit being processed. If it has been longer than that and he still cannot get a call through, there are a few things worth checking.
First, confirm that the money was added to the correct account type for that facility. Phone account funds and commissary funds are separate systems, and money deposited into the wrong one will not enable calls. Second, make sure the phone number you added is on his approved call list at the facility. Even with funded accounts, calls can only go to pre-approved numbers, and getting a new number added to that list sometimes takes a day or two depending on how the facility processes approvals.
If everything appears to be set up correctly and it has been more than a few hours, contact the phone service provider directly with your transaction confirmation and ask them to verify the deposit posted and the account is active. They can usually identify the issue quickly.
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