Unlocked Samsung Galaxy S25+ sending MMS messages delayed or failed at sending

[mustang7757]

Thank you for your help today. Odin definitely looks like a solution, but per the other commentor i'd be a bit out of my depth and at risk of bricking

You won't brick it if you read over my thread link , it might factory reset and usually takes 15 to 20 minutes to do this and you can go back , will not have issues with warranty as they are stock Samsung official firmware not doing to modify or root.
I have a follow guide on how to do in other Samsung threads I can post to help if you decide if want to.

 

[SyCoREAPER]

I'm not on the s25 if it resets , haven't flash it yet, but from others that have seems like went smoothly, but it shouldn't brick these are stock official Samsung firmwares

Thread 'Odin/Seamless Updates '

Jan 23, 2025

I don't know what's going to happen with Odin for the s25 line up with seamless updates now , might have a different Flash tool or change something in Odin but be interesting to hear anything going forward.

• mustang7757
• Replies: 22
• Forum: Samsung Galaxy S25 Series

• 

Going by what a fellow member on XDA discovered. They said you'll soft brick and end up losing everything anyway.

Heres the thread; XDA Thread

 

[mustang7757]

Going by what a fellow member on XDA discovered. They said you'll soft brick and end up losing everything anyway.

Heres the thread; XDA Thread

So you have to use regular CSC and not home CSC , this only factory resets no biggie

 

[SyCoREAPER]

Thank you. I will go to a corporate store again tomorrow and try my best. So do Verizon Corp stores have the ability to force APN changes somehow?

No but they are more than just sales commissions. They are incentivized to keep customers. Exceptions on both sides of course but authorized'a don't make money helping you, only selling you stuff.

 

[SyCoREAPER]

So you have to use regular CSC and not home CSC , this only factory resets no biggie

Correct but if you don't use it bye bye OS. In the past you could dirty flash back and forth with Home, now Home creates issues. I think it's all the A/B partition crap they implemented.

 

[mustang7757]

Correct but if you don't use it bye bye OS. In the past you could dirty flash back and forth with Home, now Home creates issues. I think it's all the A/B partition crap they implemented.

Some good stuff the main thing just use the regular CSC instead of home CSC and you're good to go just sucks it will factory reset, i agree on A/B partition

 

[trucksmoveamerica#AC]

More than likely Verizon's fault but what phone did you come from?

So much truth here. Lol

 

[mustang7757]

So much truth here. Lol

How hard is it to get an Esim from Verizon to delete and try ? T-Mobile and Att your calling them is it the same for Verizon?

 

[WiSeIVIaN]

How hard is it to get an Esim from Verizon to delete and try ? T-Mobile and Att your calling them is it the same for Verizon?

Noting, I AM able to MMS message fine with a mint sim. APN shows a proper MMSC with the mint sim card.

However with verizon sim, and verizon esim, on 2 separate unlocked s25+ phones, I have a blank MMSC and experience the outbound delays/issues.

So I agree it's a carrier problem, which some combination of Samsung, Verizon, and Google at fault, and no one clear to own a solution.

 

[mustang7757]

Noting, I AM able to MMS message fine with a mint sim. APN shows a proper MMSC with the mint sim card.

However with verizon sim, and verizon esim, on 2 separate unlocked s25+ phones, I have a blank MMSC and experience the outbound delays/issues.

So I agree it's a carrier problem, which some combination of Samsung, Verizon, and Google at fault, and no one clear to own a solution.

Yeah I can agree with that , this the reason I mentioned going to the carrier firmware as Samsung unlocked can create sometimes issues with carrier sims/Esim and Verizon is notorious for for things on unlocked firmware which other carriers don't .

 

[SyCoREAPER]

Unless you got some stupid good deal from Samsung either get comfortable with ODIN or return them and get a carrier version from Verizon.

ODIN you'll be redoing your entire phone. Carrier version you can at least copy them before sending back/returning to Samsung.

With USA Samsung phones there is 0 reason outside of cost to go unlocked anymore. You can flash a carrier phone to unlocked FW if you want to tinker or avoid where you are with VZW and just get carrier from the get-go.

 

[WiSeIVIaN]

Update:
I don't know if anyone here is able to help me, but I know there are a lot of very smart people here and I truly appreciate anyone's help or advice.

I have two separate s25+ (Unlocked) phones running android 15 purchased directly from Samsung. Both lines were previously on on Verizon with the same physical sim cards used (zero issues) on the previous s21+, s23u, s24 verizon branded phones.

The issue is with any verizon network sim or esim, my MMSC does not populate and instead says "Not set". This is the case across both phones trying 2 physical verizon sims, 3 verizon esims, and 1 visible esim. This causes outbound MMS messages to very often not send, or send at great delay (one example I sent out three MMS messages, which were received at a 5.5 hours, 4, hour, and 1 hour delay respectively).

If I use a Mint (T-mobile) sim, the mmsc populates correctly and I am able to successfully send out MMS messages with zero issues.

I know the correct MMSC that should populate, however on Android 15 it seems verizon sim APN settings are fully locked and any previous workaround apps to edit APN which I've tried haven't been successful.

I've spend 15+ hours on 4 calls with verizon tech support, 4 calls with samsung tech support, and 3 corporate verizone store visits, with no resolution in site.

I am trying to avoid leaving verizon for tmobile and incurring an $800+ bill for devices that are not paid off on my plan.

Only possible solution I've found is doing a factory reset and installing the verizon default software instead of the unlocked software, but I am not confident I can do this successfully without bricking my phones, so hoping for another option.

 

[mustang7757]

Update:
I don't know if anyone here is able to help me, but I know there are a lot of very smart people here and I truly appreciate anyone's help or advice.

I have two separate s25+ (Unlocked) phones running android 15 purchased directly from Samsung. Both lines were previously on on Verizon with the same physical sim cards used (zero issues) on the previous s21+, s23u, s24 verizon branded phones.

The issue is with any verizon network sim or esim, my MMSC does not populate and instead says "Not set". This is the case across both phones trying 2 physical verizon sims, 3 verizon esims, and 1 visible esim. This causes outbound MMS messages to very often not send, or send at great delay (one example I sent out three MMS messages, which were received at a 5.5 hours, 4, hour, and 1 hour delay respectively).

If I use a Mint (T-mobile) sim, the mmsc populates correctly and I am able to successfully send out MMS messages with zero issues.

I know the correct MMSC that should populate, however on Android 15 it seems verizon sim APN settings are fully locked and any previous workaround apps to edit APN which I've tried haven't been successful.

I've spend 15+ hours on 4 calls with verizon tech support, 4 calls with samsung tech support, and 3 corporate verizone store visits, with no resolution in site.

I am trying to avoid leaving verizon for tmobile and incurring an $800+ bill for devices that are not paid off on my plan.

Only possible solution I've found is doing a factory reset and installing the verizon default software instead of the unlocked software, but I am not confident I can do this successfully without bricking my phones, so hoping for another option.

Have you tried Samsung messages? They are not preinstalled on Samsung s25 but you can download from Galaxy store

 

[User5436]

I'm having this issue as well, but on an unlocked Pixel 9 running Android 15 via CalyxOS 6.7.20 with Verizon Wireless eSIM. I hope it's OK to share my experience on this thread.

I have tried this with several APNs:

'Default' with eSIM:

• VZWINTERNET - APN Type - default, supl, dun. The APN Type does not include mms, therefore no MMSC nor mms port specified. Inbound mms works, outbound mms fails. Sms works bidirectionally.

Custom option 1 -

• APN Type: default, supl, mms. When adding a new APN, the APN Type does not allow me to select 'dun' (grayed out). I then set MMSC to http://mms.vtext.com/servlets/mms and mms port to 80, same protocol and networks as VZWINTERNET. This option is worse with no mms inbound or outbound.

Verizon customer support was not able to help. We deleted the eSIM and tried again, no change.

Is 'dun' also doing something? I can't find any good information about this setting.

 

[WiSeIVIaN]

I'm having this issue as well, but on an unlocked Pixel 9 running Android 15 via CalyxOS 6.7.20 with Verizon Wireless eSIM. I hope it's OK to share my experience on this thread.

I have tried this with several APNs:

'Default' with eSIM:

• VZWINTERNET - APN Type - default, supl, dun. The APN Type does not include mms, therefore no MMSC nor mms port specified. Inbound mms works, outbound mms fails. Sms works bidirectionally.

Custom option 1 -

• APN Type: default, supl, mms. When adding a new APN, the APN Type does not allow me to select 'dun' (grayed out). I then set MMSC to http://mms.vtext.com/servlets/mms and mms port to 80, same protocol and networks as VZWINTERNET. This option is worse with no mms inbound or outbound.

Verizon customer support was not able to help. We deleted the eSIM and tried again, no change.

Is 'dun' also doing something? I can't find any good information about this setting.

Wow so on non-samsung phones it allows you to save-edit APN for Verizon sims?

I'm honestly surprised that adding MMSC address didn't fix the issue.

Looks like we are in the same boat unfortunately. If any of my current tries lead to a successful resolution I'll let you know. Otherwise I'm moving to a T-Mobile mnvo soon...

 

[mustang7757]

I'm having this issue as well, but on an unlocked Pixel 9 running Android 15 via CalyxOS 6.7.20 with Verizon Wireless eSIM. I hope it's OK to share my experience on this thread.

I have tried this with several APNs:

'Default' with eSIM:

• VZWINTERNET - APN Type - default, supl, dun. The APN Type does not include mms, therefore no MMSC nor mms port specified. Inbound mms works, outbound mms fails. Sms works bidirectionally.

Custom option 1 -

• APN Type: default, supl, mms. When adding a new APN, the APN Type does not allow me to select 'dun' (grayed out). I then set MMSC to http://mms.vtext.com/servlets/mms and mms port to 80, same protocol and networks as VZWINTERNET. This option is worse with no mms inbound or outbound.

Verizon customer support was not able to help. We deleted the eSIM and tried again, no change.

Is 'dun' also doing something? I can't find any good information about this setting.

Welcome to AC!
Definitely welcome to chime in