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I have an iPhone 6s running iOS12.1.4. Setting say Optus service provider v35.0
i have $50/mth sim only plan with 4gig of international and unlimited calls.
My overseas roaming I never get network selection to functioning automatically overseas. A manual network selection does work but it takes 20-30mins before it will start to function. And I often get some irregular errors messages about network settings.
In japan I find my roaming is almost non existent. My device won’t hold any connection docomo network there for more than a few seconds at a time.
id appreciate some help. Thankyou
That sounds strange. See if you can't borrow someone's phone and put you SIM in and see if the roaming works better.
Alternatively check the phone settings and see if you can't force 3G only as a test etc.
A good suggestion from Peter.
I suspect trying to use an iPhone 6s in Japan is the issue here.
While iPhone 6s may be the problem. My research thus far does not agree with that being the issue.
I went to the website
and searching for iPhone 6s model A1688, japan, NTT docomo as the carrier
it lists the A1688 as working with 3G and 4G but not 2G in Japan. It lists working with all carriers on 3G except Y!Mobile.
Do I need to select some sort of network carrier reset?
I made a call from Osaka to Sydney last month but phone after the call the network connection again became very intermittent. So it does work it’s just on and off - but much more “no service” than holding a connection.
Ive just arrived in Narita, Japan for 24hrs this evening. Thanks for any help. Pete
It may be an issue with the local network that the phone has automatically connected to.
Please try going into the Settings and performing a manual network selection, choosing another Japanese network to see if that does the trick,.
Great news that you got it working!
I don't believe there is a list available to customers, generally as it isn't required as the automatic connection usually works.
Not sure why Optus decided to hide the information but they have a roaming tool here.
Unfortunately clicking a country provides generic "Zone X" information.
However you can drill down to an individual country by manually adding it at the end of the url:
So for example add "japan" to the end of that and you'll get here
Doesn't work for all countries and may be out of date in some respects but does provide a handy list of local telcos to try.
Just a note that those tools are for Business Enterprise accounts.
The consumer one can be found here.