IPhone problems ( iMessage)?

When I message someone on iMessage sometimes my messages deliver to the other persons phone and sometimes they don't even when they say delivered so I have no clue that they haven't received them until I'm waiting hours for a reply and I text them again on iMessage asking if they have got my message they usually say no.
I have reset my phone, turnt it off and on, turnt iMessage off and on and it still does the same problem.
For example I can't have a conversation with someone as I'll message them back and the message says delivered but doesn't get to them so they must think I'm ignoring them when I'm waiting on a reply when they never got my message in the first place. Sometimes text messages don't sent either…
I was just wondering does anyone know why this is happening or do they know how to fix this as soon as possible!

1. Send a message while connected to Wi-Fi. Sometimes the signal can be cut or intermittent.

2. Check your carrier, as there can be minor or drastic speed delays between carriers

3. Check your carrier APN settings to see if you have the most up to date settings. Having the correct settings can make a huge difference in speed and reliability

4. Have your phones Wi-Fi cables, signal range and strength checked by a "PROFESSIONAL" repair shop to see if you have any internal parts issues.

Hope this helps

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