Hi there! I understand you're having trouble with your Dollar General digital coupons not working on your new phone, even though you're using your old phone number but a new email address. Let’s see if we can get this straightened out.

First, I want to clarify a couple of things to better assist you:
- Are you trying to access your Dollar General digital coupons through the app or the website?
- Have you already tried signing in with your new email address on the new phone?
- Are you able to access your account on the new device at all, or is the issue specifically with the digital coupons not showing or functioning?

Meanwhile, here are some basic steps you can try to resolve issues related to changing devices and emails:

1. Sign in with correct credentials: Make sure you sign into the Dollar General account using your new email address and your existing password. Dropping the old email might cause some confusion if the account info isn't fully updated.

2. Account update: Sometimes, having a new email can mean the account details need updating. Log into your account on the Dollar General website or app and check your profile information. Update your email address there if it still shows the old one.

3. Phone number linking: Digital coupons often rely on your phone number to link offers at checkout. Since you have your old number, double-check that your account profile includes this correct phone number.

4. Clear app cache (if using the app): On Android 10, go to Settings > Apps > Dollar General app > Storage > Clear Cache. Then restart the app and sign in again.

5. Check for app updates: Make sure the Dollar General app is updated to the latest version from the Google Play Store.

6. Try using the website: If the app is giving trouble, try accessing your coupons through the Dollar General website using your new email and old phone number.

If you have tried any of these already, let me know which ones, and I can help guide you to the next steps. Also, if you see any specific error messages, please share them with me.

Does that sound good? Are you able to try these and tell me how it goes?