Hi there! I see you’re using a prepaid Securus phone account on your iPhone, and after receiving calls, your balance isn’t updating or reflecting any changes. Let’s try to get that sorted out together.

First, just to clarify a couple of things to better assist you:

1. When you say the balance stays the same, have you checked your balance immediately after a call and then after some time (like after a few minutes or longer)?
2. Are you checking your balance through the Securus mobile app or the website?
3. Have you received any error messages or notifications during or after calls?

Balances on prepaid accounts sometimes take time to update due to system processing delays, but let's go through some steps to be sure:

### Step-by-step guidance:

1. Log out and log back into the Securus app:
Sometimes, app data needs to refresh. Completely close the app on your iPhone (swipe it away from multitasking), then open it again and sign in to see if the balance updates.

2. Check your recent transactions or call details:
In the app, look for a section like "Call details" or "Transaction summary." This will show if your recent calls are being recorded properly.

3. Refresh the account status:
Some versions of the Securus app or the mobile website have a "refresh" or "update" button to manually update account balances. Try locating and using that.

4. Verify that calls actually billed against your account:
Confirm that the incoming calls you mentioned are indeed charged to your prepaid account. Sometimes, calls may be free or covered by other arrangements like Friends & Family plans.

5. Network and app version check:
Ensure your iPhone’s iOS (which you have updated to 16.3.1) and the Securus app are both updated to the latest versions. Outdated versions can cause syncing or display issues.

6. Allow processing time:
According to Securus, the stated prepaid balance may not immediately reflect recent call activity due to time required to update accounts for calls made8.

If after these you still see no changes, there may be a delay or issue on the backend with your account's transaction processing.

### Next steps if the issue persists:

- Try accessing your account on a desktop browser via https://securustech.net/mobile/index.html to compare the balance shown there with your app.

- If discrepancies remain, it would be helpful to contact Securus Customer Support directly to check if your account has a syncing issue or a system delay.

Would you like me to guide you through checking any specific step, or do you want me to help you prepare for contacting customer support with all the right info?