Zero1 Mobile discussion thread

[Synnexo]

Folks can consider call divert to an invalid number using this code **21*+651# to avoid expensive roaming charges. To deactivate use this code ##21#.

StarHub call divert

 

[twosix]

Actually that should be for any incoming call right ? Not just SG ?


Er, true but can be mitigated to some extend :
Using telco that cannot receive incoming call while roaming, or disable notification for phone & messages when roaming.

Yes, if one does not want to pay for roaming calls. But z1 app can be configured to block incoming overseas calls, so that leaves only Singapore calls.

 

[TyL3r_DuRd3n]

I received scam calls based on SG numbers before. no +65/+44/+855 etc
just 8 digit singapore phone numbers starting with number 6/8/9

 

[crystalnox]

I received scam calls based on SG numbers before. no +65/+44/+855 etc
just 8 digit singapore phone numbers starting with number 6/8/9

Plenty of local “Taikong” SIM cards on sale on Carousell. Easy to just buy and spam, just need one victim to earn back many times the cost.

 

[twosix]

I received scam calls based on SG numbers before. no +65/+44/+855 etc
just 8 digit singapore phone numbers starting with number 6/8/9

Same here. 2x from same number some more.

 

[poland_ball]

Any got charged so far? Maybe can share their real life experience, no point speculating on unknown territories..

Pls see my post

 

[gapboy]

Pls see my post

I see you got a charged call divert.. so it is not a guaranteed solution

 

[poland_ball]

I see you got a charged call divert.. so it is not a guaranteed solution

As mentioned in post 9620, you will have to do the divert in sg and then never turn on the line overseas. Which kinda defeats the point of having the line in the first place.

 

[TyL3r_DuRd3n]

i think it defeats the purpose indeed

 

[twosix]

As mentioned in post 9620, you will have to do the divert in sg and then never turn on the line overseas. Which kinda defeats the point of having the line in the first place.

Haha. Easiest is to just mute the incoming call and let it timeout.

 

[TyL3r_DuRd3n]

Thank you for the email.

The “Block International Incoming Calls” function in the Zero1 App applies only within Singapore.
When you are roaming overseas (e.g. in Malaysia), international incoming calls will still come through and be chargeable under roaming voice rates, regardless of whether you answer the call.

Please note that roaming is provisioned as a complete service bundle, which includes:
• Roaming Data
• Roaming Voice
• Roaming SMS

These components cannot be enabled or disabled separately — they work together as one package.
While overseas, kindly take note:

• Incoming and outgoing voice calls, as well as outgoing SMS, are chargeable based on roaming rates.
• Incoming SMS are free of charge and will still be delivered to your Zero1 line, as long as you are connected to our supported roaming partner network.

You may refer to our full roaming voice and SMS rates here:
https://support.zero1.sg/kb/a215/what-are-the-roaming-voice-and-sms-rates.aspx


Yours Sincerely,
Doris
Zero1 Team

as per their email, i tink they will charge if there is a call coming in.
let me clarify with them.

 

[TyL3r_DuRd3n]

Hi TyL3r_DuRd3n,
Thank you for reaching out and for sharing your concerns. I’d like to clarify how roaming charges apply to incoming calls while your line is connected to a roaming partner’s network.
As mentioned earlier, once your mobile line connects to our roaming partner’s network, all incoming and outgoing calls — including missed or rejected calls — will incur roaming charges. This happens because the roaming partner network activates and attempts to route the call to your device the moment it reaches their network. Even if the call is not answered, the connection attempt itself generates a charge.
To address your specific questions:

• If it is a scam call and I let it drop:
  Yes, a charge will still be incurred. The roaming network has already attempted to deliver the call to your device, which triggers the roaming voice rate, regardless of whether you answer.
• If I reject the call:
  Yes, a charge will still apply. Rejecting the call does not prevent the roaming network from registering that an attempt was made to reach your device, and this attempt is treated as a billable event.
• Outgoing SMS while roaming:
  Any outgoing SMS sent while roaming will also be charged according to the prevailing roaming SMS rates.

We understand this can be concerning, especially in the case of scam or unwanted calls. To minimize costs while roaming, we recommend:

1. Disabling Data Roaming and Voice Roaming if you do not need them.
2. Using Wi-Fi-based apps (e.g., WhatsApp, Telegram, FaceTime) instead of cellular voice/SMS.

We hope this clarifies the mechanics of roaming charges for incoming calls. Please feel free to share this explanation with your community or reach out if you need further assistance.
Best regards,

Yours Sincerely,
Doris
Zero1 Team

 

[sango65]

maybe the only way is to force your phone to use data when roaming and cant receive call (VOLTE not enabled), provided the overseas country use VOLTE calling and not 3G calling.

For my POCO F4, I can force the phone to use data and cant receive calls

When VOLTE is activated, then can receive calls

 

[poland_ball]

Hi TyL3r_DuRd3n,
Thank you for reaching out and for sharing your concerns. I’d like to clarify how roaming charges apply to incoming calls while your line is connected to a roaming partner’s network.
As mentioned earlier, once your mobile line connects to our roaming partner’s network, all incoming and outgoing calls — including missed or rejected calls — will incur roaming charges. This happens because the roaming partner network activates and attempts to route the call to your device the moment it reaches their network. Even if the call is not answered, the connection attempt itself generates a charge.
To address your specific questions:

• If it is a scam call and I let it drop:
  Yes, a charge will still be incurred. The roaming network has already attempted to deliver the call to your device, which triggers the roaming voice rate, regardless of whether you answer.
• If I reject the call:
  Yes, a charge will still apply. Rejecting the call does not prevent the roaming network from registering that an attempt was made to reach your device, and this attempt is treated as a billable event.
• Outgoing SMS while roaming:
  Any outgoing SMS sent while roaming will also be charged according to the prevailing roaming SMS rates.

We understand this can be concerning, especially in the case of scam or unwanted calls. To minimize costs while roaming, we recommend:

1. Disabling Data Roaming and Voice Roaming if you do not need them.
2. Using Wi-Fi-based apps (e.g., WhatsApp, Telegram, FaceTime) instead of cellular voice/SMS.

We hope this clarifies the mechanics of roaming charges for incoming calls. Please feel free to share this explanation with your community or reach out if you need further assistance.
Best regards,

Yours Sincerely,
Doris
Zero1 Team

This is not consistent with the practices of other telcos though, which all say no charge if call is not connected. Plus their pricing mechanism says it is charged per 60s block of voice call. If nvr pick up/rejected, how can there be any 'airtime' to charge for?

Also, how to disable voice roaming?

 

[TyL3r_DuRd3n]

This is not consistent with the practices of other telcos though, which all say no charge if call is not connected. Plus their pricing mechanism says it is charged per 60s block of voice call. If nvr pick up/rejected, how can there be any 'airtime' to charge for?

Also, how to disable voice roaming?

yeah, this is one way zero1 is milking us.

to disable, you may want to disable VoLTE as a workaround as per Sango65's out-of-box-genius-solution.
Unfortunately, I cannot use the workaround as I am using iOS
VoLTE cannot be disabled.

 

[sango65]

This is not consistent with the practices of other telcos though, which all say no charge if call is not connected. Plus their pricing mechanism says it is charged per 60s block of voice call. If nvr pick up/rejected, how can there be any 'airtime' to charge for?

Also, how to disable voice roaming?

maybe is really Singtel's practices. Zero1 is a Singtel MVNO. So I presume zym, Vivifi and CMLink also charge voice roaming

 

[poland_ball]

yeah, this is one way zero1 is milking us.

to disable, you may want to disable VoLTE as a workaround as per Sango65's out-of-box-genius-solution.
Unfortunately, I cannot use the workaround as I am using iOS
VoLTE cannot be disabled.

I also using iOS…. If their suggestion is to disable voice roaming they should have an option to do it on their backend

 

[JAYSCS]

If call roaming charges are a concern and you happen to travel with the line frequently. Port out to or stick to Eight or Simba, whatever disadvantage these telcos face at home are still worthwhile, peace of mind while traveling is utmost important.

 

[JAYSCS]

i think it defeats the purpose indeed

The purpose is simply using your device & line for functions that works on wifi like WA, UTube, emails, etc. In a way it is still handy but not full fletch and less fun out of it. A good wifi solution is get a spare cheap data only line with roaming data, use it as wifi-hotspot, can even share data with traveling buddies.

 

[sango65]

If call roaming charges are a concern and you happen to travel with the line frequently. Port out to or stick to Eight or Simba, whatever disadvantage these telcos face at home are still worthwhile, peace of mind while traveling is utmost important.

think some users will feel heartpain cos when they sign up for Singtel MVNOs, they have 600GB roaming data which can be used in Msia, Thailand and Indonesia (valid for 1 year). But with this call roaming nonsense, they cant use the roaming data when travelling in these 3 countries.