Previously, I used an M1 plan and never had to turn on data to receive SMS.
I have a few questions about using my phone abroad.
1. Do I need to enable data roaming when traveling internationally to receive SMS, and can I avoid high charges just for receiving text messages if data roaming is required?
2. I'm sure that my father's M1 subscription doesn’t need data roaming to receive SMS from Singapore numbers while he's overseas.
3. Can I insert a SIMBA SIM into a basic Nokia phone with Symbian OS and still receive SMS?
4. I'm confused because I can receive SMS from local numbers(while in overseas, roaming country) while I'm abroad, but not from Singapore numbers. Why might this be happening?
4G is pure data network right ? In 3G, no data is required for SMS delivery, but in 4G, I suspect it is probably required, although it might be possible to route that thru wifi calling, provided that is working.
M1 customers are able to receive SMS overseas without data roaming after 3G shutdown, since they might still be able to connect to roaming partners that still have 3G. I am not sure if that still works if the roaming partner no longer operates 3G and data roaming is off.
Are you connected on 3G or 4G network during roaming ?
Have you tried forcing to 3G or 4G ?
I am doubtful that the SIMBA sim on Nokia Symbian OS would make any difference with regards to receiving SMS.
The best part is that you can receive local SMS, which for them is an international SMS from a billing point of view. I wonder if that is routed locally within the roaming partner's network or back to SG first. If it is routed locally, then this behavior can be explained, but I have doubts that is the case though.
Don't think VoLTE support is an issue here, M1 customers are able to receive SMS in SG after 3G shutdown, it goes to show that 4G with data, without VoLTE, can still deliver SMS, at least in M1's case.