Random dropping of calls

[Unitysounduk]

Hi every now and then my call will drop iv tried changing phone so I know it's got to do with my SIM 

Has anyone encountered this issue 

[MSF]

@Unitysounduk There have been other reports of this. Have you looked at Coverage and Network Status for your area first?

There are suggestions of congestion on some masts and sometimes properties are shielded from receiving a good signal.

[Unitysounduk]

@MSF 

Hi thank you for your reply 

It's been happening for months now I got a new phone because I believed it was the phone but it's not it's the SIM I ordered a replacement SIM but still having the same issue with the new SIM 

[SmartyTrousers]

So how does replacing your phone prove that the phone wasn't the issue, but replacing the SIM proves that the SIM was the issue?

[Unitysounduk]

@SmartyTrousers 

Hi thank you for your reply 

I replaced the phone for a new phone thinking it was the phone but still have the same drop calls with the new phone I got a replacement SIM but still the drop calls 

Leading me to believe it an issue with the network 

Iv tried a different SIM on a different network in the new phone with no issues 

This issue has been happening for months 

Any ideas on why ?

[MSF]

@Unitysounduk  So it's looking like a poor signal level where you are. You have looked at the phone and the sim and excluded problems with either of those - it just leaves the signal. 

Has it been worse since 3G was turned off? More pressure on 4G and 5G signal?

[Unitysounduk]

@MSF 

It happens randomly it's been happening since the switch off of 3G since February 2024 when it happens I still have like 3 bars of reception 

[SmartyTrousers]

@Unitysounduk What makes and models are the two phones you've tried? Are they definitely compatible with Smarty's 4G calling (which is not the same thing as them supporting 4G calling generally)?

[Unitysounduk]

@SmartyTrousers 

Samsung galaxy s23 and s24 ultra 

They are both on the list as compatible 

[SmartyTrousers]

@Unitysounduk  Well, there is no 'compatible' list, just an incompatible list, but I don't think it's comprehensive.

Ultimately, if these issues started when Three's 3G switch off started, and you seem to have decent signal strength where you are, and SIMs from other networks are not having an issue, it does point to incompatibility with Smarty's VoLTE probably being the issue.

Before the 3G switch-off, did your S23 used to drop down to 3G when you made or received calls?

[Unitysounduk]

@SmartyTrousers 

No my s23 ultra didn't drop to 3g when making calls 

Both phones are compatible with voLTE calls both s23 and s24 ultra 

[SmartyTrousers]

@Unitysounduk As I mentioned, being compatible with VoLTE, and being compatible with Smarty's specific VoLTE configuration, are not the same thing.

Have you noticed any common theme with the dropped calls? For example, do they always happen after a certain amount of time? Are they always incoming/outgoing calls?

[Unitysounduk]

@SmartyTrousers 

They happen for incoming and outgoing calls it randomly happens sometimes I'm able to make a call for 30 minutes without it happening sometimes after 5 minutes it will drop and I have to ring back