I have a question WRT sim capacity. I have a sim with 100 contacts which I find unworkable running a business. I would like a larger sim and believe there are sim's with 250 contacts available and larger. What is the general concensus? I don't want to spread contacts all over the place, I'd prefer them to be on the sim as thats what it's for. Do Optus have a larger sim?
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While I know the sim specification can support up to 500 contacts depending on storage capacity of the sim. I have never seen any different capacity sims on Optus (nor Telstra)
Most phones store contacts via google or apple cloud storage or directly in the phones memory itself and not on the sim.
What phone do you have?
Can't answer your technical question but have you've considered moving beyond SIM contacts? As you say its a bare bones system that worked well but has been replaced by much better options these days. If you have an Android phone then you should have a free google account. You can place as many contacts in there as you like plus lots of contact info (Birthdays, email address, physical address etc. The contacts are automatically backed up always. You can edit / add them on the phone or on any PC. Group into Categories. If you loose/buy another phone just enter your gmail account address and you have all your contacts back again. There's also a complete call history etc. Obviously no limit on entries. Once dealing with that I also start slowly adding reminders to the google calander that help schedule things.
Of course if you have iPhone there's similar options there too.
I also have a Note 8.
If you open your Contacts app (not the phone app)
Click the three dot icon on top right of the page.
Click Manage Contacts
Click Default storage location
Mine gives me option of
Also has an add account with other ways to store contacts.
Storing contacts via google i can share them with my other phone etc.