Samsung S20/Note20/S10/Note10 and other phones can't receive or send MMS on Wi-Fi


Samsung Galaxy S10

Hi! Its certainly been awhile since my last post. Life has been busy with being elected Mayor in January, and the COVID19 pandemic. Today, I come to you with another fix to an issue that seems to be pretty common right now. This will work for any Samsung Phone that has Wi-Fi Calling. 

Since a recent update, many Samsung Phones will not send or receive MMS(Multimedia Messages) over Wi-Fi. This issue seems to happen more with the Samsung Messages app, but it also happens with the Google Messages app, even if your are using RCS Chat Features. 

The fix for this issue is two fold:

1. Ensure your router is not blocking outgoing traffic on the following ports: 

TCP/UDP Port 500 (IKEv2)

UDP Port 4500 (IKEv2) 

TCP Port 143 (IMAP)

Wi-Fi Calling, Texting, and MMS over Wi-Fi will not work reliably if your router or firewall is blocking outgoing connections on those ports. Some routers simply block that traffic with no way to open the ports, in that case you simply have to replace the router with one that either doesn't block it, or allows you to allow it though.

2. Put your Phone in Airplane Mode when in areas with low signal

If you are in an area such as a basement, office, home, etc and you notice your cellular service is weak, put your phone into Airplane mode and then turn on Wi-Fi and Wi-Fi Calling.

Samsung Notification Panel

Samsung Settings page

There is a bug in the Samsung software that when your cellular service gets weak, it doesn't properly route your Text/MMS data through the Wi-Fi connection, and instead tries to use the cellular and you end up not receiving MMS, or you get message send failures. So turning on Airplane Mode and enabling Wi-Fi and Wi-Fi calling resolves this issue. 

Once you get back to regular cell reception, you can turn Airplane Mode off, and everything will work as normal. 

This has been a life saver for me when working in an area with poor service and texting/mms wasn't working right. I didn't see much online about this issue, so I figured I'd post a solution. 

Until next time, take care!

Disclaimer: I am not responsible for anything that may happen to your PC when changing settings or changing registry values. If you choose to make changes, you do so at your own risk.. You are solely responsible for any damage to your computer , data, or other hardware due to user error, inadequate cooling, too high of voltages, incorrect software settings, and any other factors. Please remember to back up your computer before attempting this. If overclocking, Do not Overclock on the stock AMD or Intel CPU Heatsink and fans. Use Aftermarket cooling heat sinks of sufficient TDP or water cooling to ensure best chance of not having premature hardware failure. As always, remember to backup your data before attempting any change. I am not responsible for data loss or damage of any kind.

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