I'm curious about that, during setup my iPhone mentioned "Data fallback" but I only see an option for "Allow Mobile Data Switching" which says "Turning this feature on will allow your phone to use mobile data from both lines depending on coverage and availability" - Doesn't seem like it takes into account what's primary/secondary?for a 2nd sim I’ve been happy with Lyca, now it works on EE.
I’ve had O2 100GB but never need that much data and so decided two cheap sims was better than one big allowance.
I need to stick with the main networks to support my Apple watch so have O2 as my primary sim and Lycamobile on EE as my backup.
iPhones will auto swap to the 2nd sim if signal is poor for data.
both are E-Sims
It does, if your primary SIM is absolutely dead, like 0 bars, it will switch to the other back up one automatically. It will also connect to the original SIM's IMS services to still be able to make calls with it even if you have no service, think of it like WiFi call over data.I'm curious about that, during setup my iPhone mentioned "Data fallback" but I only see an option for "Allow Mobile Data Switching" which says "Turning this feature on will allow your phone to use mobile data from both lines depending on coverage and availability" - Doesn't seem like it takes into account what's primary/secondary?
- I don't want it burning my backup data un-necessarily.

It routes Voice traffic over that Data connection? Cool! Kudos for the easy-to-understand explanation too.It does, if your primary SIM is absolutely dead, like 0 bars, it will switch to the other back up one automatically. It will also connect to the original SIM's IMS services to still be able to make calls with it even if you have no service, think of it like WiFi call over data.
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Mate, I'm paying Voxi atm soon moving to iD £6 for 8GB a month on 30dayw/rollover, then like £2 a month for bnesim which gives me O2/EE/3 1GB backup data. Who's the cheapskate nowI must admit the Lyca eSIM is incredibly easy to set up.
I became a 'New' Lyca customer for the sixth time today for my Galaxy watch, it all works a treat.
I switched to the lowest 3GB bundle.(£3.90)
The bitrate of Spotify must be incredibly low as surprisingly I struggle to reach 2GB streaming every day for about an hour, sometimes more.
It still sounds fine quality wise too.
All this to save £1 from the 6GB bundle (£4.90)
Well why pay more when you don't use it?
Cheapskate extraordinaire? That's me.![]()
Yes it does switch back automatically. Naturally, if the network supports it, it can also route SMS over the second Sims data connection too (VToW - Voice Text over WiFi). I think if anything, for a good backup, you'd want EE/Three SIM 1 and then O2/Vodafone SIM 2. This is because of their mast sharing agreements. If EE and Three are sharing a mast that doesn't reach into an area O2/Vodafone have a mast it's a pretty sore backup solution!It routes Voice traffic over that Data connection? Cool! Kudos for the easy-to-understand explanation too.
I want to know if it will switch back to primary automatically (without having to encounter the 0 bars).
If it doesn't automatically switch back, I'll be more tempted to go with something like the Lyca £1.99 deal for 5GB eSIM and use 3Primary/EESecondary. So I get a bigger allowance and don't have to worry about switching it back manually.
I'll see how iD mobile treats me with O2/EE Backup, if it fails me some-day, I'll switch to Lebara primarily and then have 3/O2/EE backup on a budget, can't beat that! lolYes it does switch back automatically. Naturally, if the network supports it, it can also route SMS over the second Sims data connection too (VToW - Voice Text over WiFi). I think if anything, for a good backup, you'd want EE/Three SIM 1 and then O2/Vodafone SIM 2. This is because of their mast sharing agreements. If EE and Three are sharing a mast that doesn't reach into an area O2/Vodafone have a mast it's a pretty sore backup solution!
If anything, I'd swap iD for Lebara now if you want ultra reliability. Vodafone is already a very reliable Network compared to three which, despite already being very very reliable to me, I have noticed toward the west I struggled to get service (was in blackpool the other day and had full Vodafone service on payg) and naff all signal with three, struggling to see any network at all at some points. The benefit to Three though is that 5G fast goodness. That's why I stick with them.I'll see how iD mobile treats me with O2/EE Backup, if it fails me some-day, I'll switch to Lebara primarily and then have 3/O2/EE backup on a budget, can't beat that! lol
Tbh, I would however, I've essentially got 3 months of iD for free as when moving my Direct Debit date, my allowance didn't increase like it should have so they credited me £20 which is effectively 3 months worthIf anything, I'd swap iD for Lebara now if you want ultra reliability. Vodafone is already a very reliable Network compared to three which, despite already being very very reliable to me, I have noticed toward the west I struggled to get service (was in blackpool the other day and had full Vodafone service on payg) and naff all signal with three, struggling to see any network at all at some points. The benefit to Three though is that 5G fast goodness. That's why I stick with them.