My wife and I had been with Vodafone for a good few years, and I also have a second phone for business which is registered on 3 network.
We moved to our current location just over 2 years ago and transferred 2 of our 3 phones to ID Mobile a few months ago.
Prior to transferring to ID we had not experienced any connection issues with 3 or Vodafone - however once we changed networks the problems started, but only on the 2 phones using the ID Mobile sims.
The problem occurs periodically with the ID Mobile Sims phones suddenly losing signal connection (ie showing zero bars on the signal strength indicator) whilst we are away from the house, but the signal returning when we arrive home.
If we restart either phone and return to the spot where the signal was previously lost, the signal is perfect on that phone - until a couple of days later. So it is not a coverage issue
At no time do we loose the signal on the phone with the 3 sim card.
These symptoms suggest that the problem is with the ID network or Sim cards but there is no indication as to which it is.
There have been a number of posts on this community reporting similar problems which seems to indicate that ID have an issue that needs resolving.
We are currently 'in contract', but as soon as that ends, if the problem persists, we will have to look elsewhere for a more reliable network.