Hi MorganBalla
There is workaround for such a scenario which I have copied from our SureSignal Troubleshooting thread, please follow this and let me know how you get on. 
When a SIM change is performed it can take up to 2 hours for the Sure Signal system to recognise the change, during this period you won't be able to pick up any signal from the Sure Signal. If you still experience issues after this time then you'll need to remove the affected number from your Sure Signal and then add it back on, this can be done via My Account.
If the affected number is the owner of the Sure Signal, you'll need to temporarily transfer the ownership to another number in order to remove/re-add the affected number. This can be done by clicking Change Owner on the Sure Signal Dashboard. The new owner will then need to login to their My Account profile and accept the ownership request, before removing and re-adding the number. Once this has been completed then the ownership can be transferred back to the original number.
Hi Andrew_McCreath
I have resynced your device, please try to reconnect and follow the steps above if this has not been successful and let me know how you get on.
Many Thanks
DaveCD
eForum Team
Hey rscoley,
Thanks for your post.
I've checked the VSS and can see it's been flagged for a resynchronisation. I've therefore forced this through for you. Could you factory reset the device and let me know if there are any remaining issues?
- Hold the reset button till all the lights come on or flash (about 30 seconds)
- Keeping the reset button held, remove and re-insert the power lead
- Once all the lights come back on or flash, release the reset button
- The VSS will come online within the hour
Cheers,
Lee
Hi Guys,
@ simdeakin08, looking at the registration everything looks fine and a connection was made yesterday. I have re-synced the Sure Signal today, please can you give this one hour and let me know if the issue continues.
@ GaryRobertson, to be honest there is no reason why the iPhone shouldn’t be working with the Sure Signal as the only issue it will normally have is for the signal from the network to hand over to the iPhone if a call or data connection is still active which is resolved by toggling the airplane mode.
Firstly can I ask for the Sure Signal serial number?
Secondly, how long have you had the new SIM? Do you have a friend’s iPhone that you could test your SIM in to see if there is an issue with the phone or SIM?
Do you have issue picking up the network whilst out and about?
James
Hi Andrew_McCreath,
Can I ask where the sure signal is located in regards to your router?
The reason that I ask is that it is strange that you aren’t seeing full 3G signal on either phone.
I would recommend moving the Sure Signal away from the router to begin with to see if this improves the signal on your phone however in regards to your wife’s iPhone 4S please can you try to put the iPhone 4S into airplane mode and then back into normal mode and also remove and add the number for this phone on the Sure Signal.
If this still doesn’t work, please let me know so I can feed it back for you.
James
Hi Andrew,
This is getting more curious!
Looking at the VSS I can see it's regularly connecting to the servers. Are you able to try any other 3G enabled phones to see if they show full signal?
The VSS should provide full bars rather than 1 or 3 bars. I've just checked the coverage map and there's no 3G available at your postcode at all so the fact you're picking 3G up would mean the VSS is doing its job! I'm sure you'd argue that point though 
What happens if you switch SIM cards?
Is there any change?
Does your SIM in your wife's phone also show 1 bar?
Does your wife's SIM in your phone show 3 bars?
In essence I'm trying to establish if the SIM cards could be at fault or possibly the handsets ability to pick up a full signal from the VSS.
If you could try these suggestions it would be a great help.
Cheers,
Lee
Hi guys,
darkone338 - Thanks for posting that. If you can confirm your Sure signal serial number for me, though, we may be able to stop you needing to do that, as it appears that the network is not handing over to the Sure Signal properly.
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stevendg - I've re-synced your Sure Signal for you. Can you perform a factory reset for me to complete this?
- Hold down the reset button until all the lights show (about 30 seconds)
- Keeping the reset button held down, remove then re-insert the power lead.
- Once all lights display release the reset button.
- The Sure Signal will come online in around 1 hour.
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matala - If only the power light is showing, this means that the Sure Signal is not connecting to the internet.
Please can you try the steps in this section of our Sure Signal troubleshooting thread?
Let us know how you get on.
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Adeph - Which lights do you have showing on the Sure Signal box? If you have the newer box, you're looking for the power and system lights, whilst with the older one, it’s lights 1, 2 and 4
If when your wife upgraded the SIM changed, then you may need to follow the steps listed here for a change of SIM card with your Sure Signal.
Again, let us know if this page helps.
Dave
