Text messages not delivering

[nthnu]

On my S21 (unlocked, Verizon, fully updated) I can send a long text to another S21 but it never delivers. If I send same long message to an LG or iPhone the message is delivered. I can send messages under 160 characters no problem. Any ideas?

[Charkatak]

Can that other s21 get phone calls from you? Just want to make sure you are not blocked on their end

[nthnu]

Phone calls work.
If i send an sms under 160 characters it's fine. The longer ones always fail.

[LongHiker]

@nthnu So this is one specific S21? It probably points to that device using the wrong APN or an SMS APN configuration issue at the carrier.

[kmojo083]

I am having the same issue with my S21, however it's not delivering to iPhones if over 160 characters

[nthnu]

I'm using the stock Messages app and came across a tip.

Text messages over 160 characters still don't send. It's very inconvenient, but if I add a subject to the text message, it converts it to MMS and it sends.

I also have a ticket in with Verizon.

[nthnu]

This is what my APN shows

[Wecia2906]

I have this same issue. I can not send a text over 160 characters to anyone. I found out my issue, maybe it's yours as well and this helps. I contacted Samsung and found out that on their end it shows my phone is not updated to the newest software. On my phone it states that it is. They told me my phone somehow got out of sync with their servers. To fix this you can take your phone to a best buy and get them to connect the phone to a computer that has samsung software so it can get back in sync. This service should be free of charge. 

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[nthnu · Accepted solution]

I was gonna wait to see if it truly fixed it before posting.
I ended up getting replacement SIM cards for both phones on Monday and so far messages over 160 characters are going through.