Car phones and sim cards - midlifecrisis
Still dithering about my mid life crisis car. One of the cars I'm considering has a built in phone with a sim card slot. My phone contract is up for renewal this month and I think I'm right in saying that o2 won't supply two sim cards with the same number. (one for my phone,one for the car)

Anyone know which phone companies do?
Car phones and sim cards - local yokel
I don't think it's technically feasible to use two identical SIMs, unless one is always off when the other is on. The whole piont of the SIM is to tell the network the subscriber's ID, so the network can route calls to it, and bill the subscriber for calls from that phone. If both SIMs were in active phones then the network wouldn't know which one to route a call to.

The work-around is to have each SIM set up with automatic forwarding to the other when not switched on, which is of course expensive.
Car phones and sim cards - SpamCan61 {P}
Yes it is a bit like having two cars with the same registration number, but a friend of mine did have a Vodafone account with two SIMs a couple of years back - I can't find any info on it on the Voda web site mind you :-(
Car phones and sim cards - Bill Payer
You can cetainly get dual sims with Vodafone and Orange, and you set the priority in which they're to be called.
Car phones and sim cards - rtj70
I know with Vodafone you call a special number to activate the phone you want to use. Downside can be you forget and the car phone takes all the calls and text messages when you're not in it and you wonder why the phone has been quiet today.
Car phones and sim cards - Happy Blue!
...The work-around is to have each SIM set up with automatic forwarding to the other when not switched on, which is of course expensive...

If you have two or more lines on one T-mobile business account, calls between them are always free. So you could do this easily and cheaply.
Car phones and sim cards - rtj70
"If you have two or more lines on one T-mobile business account, calls between them are always free. So you could do this easily and cheaply."

But this requires two lines hence twice the monthly rental cost? The Vodafone solution uses the same line/account and does not need to be a business one either. You have two SIMs for the same phone number but only one is active at the same time.
Car phones and sim cards - drbe
A related topic.......................

I understand that Orange fiddle with the software on the phones they supply, so that the SIM card cant be switched around, which is something I sometimes find it convenient to do.

My question is - are all other SIM cards interchangeable between phones? Will the SIM card from a Nokia E or N series work in another phone and vice-versa?
Car phones and sim cards - rtj70
SIM cards should work in other phones as long as the phone you are swapping it in to has not be locked to a network that is different to the phone you're swapping from.

For pay-as-you-go from say CarPhoneWarehouse, all non-3G phones are unlocked so they can put any SIM in it. But ALL 3G phones will be locked to a particular network. And since the Nokia E and N series are Symbian smartphones, they are likely to be locked to the network. Unless of course the phone was purchased without a subscription and accompanying network subsidy and therefore unlocked. My Nokia N70 was free from Vodafone on a contract but £300 unlocked from eXpansys.
Car phones and sim cards - local yokel
A quick Google will find you plenty of people who will unlock any phone for <£15.
Car phones and sim cards - drbe
What I was getting at with my question was - are the SIM cards potentially compatible or are they completely incompatible i.e. are they the same size and shape etc?
Car phones and sim cards - rtj70
SIM cards are the same size/shape regardless of network.
Car phones and sim cards - eProf
SIM cards are the same size/shape regardless of network.


...and of country! When I was living in South Africa I could swap my SIM from Vodacom (SA) to Orange (UK) in a phone that was under contract to Vodacom. Useful!

--
e Prof - Another Recycled Teenager
Car phones and sim cards - local yokel
> SIM cards are the same size/shape regardless of network.

Except Three - their SIMs are unique, and are not interchangeable with Voda, o2, T-Mobile and Orange.
Car phones and sim cards - midlifecrisis
I'd want to be able to switch the mobile off when I'm in the car and use the car phone, without having to mess about changing settings etc!
Car phones and sim cards - local yokel
Why not just have a car with a nicely engineered cradle for your mobile? ISTR that the Nokia 6310 was built into one model of car?
Car phones and sim cards - Happy Blue!
or a Parrot! CK3100
Car phones and sim cards - Bromptonaut
I understand that Orange fiddle with the software on the phones
they supply, so that the SIM card cant be switched around,
which is something I sometimes find it convenient to do.


My son and i have swapped Orange 'phones (keeping our original SIM) in the last month with no trouble. His was PAYG, mine a contract item. Both were supplied by Orange's retail arm - undrstand that if you buy from Carphone Warehouse phone most phones are unlocked.


This on the standard GSM service - may be diferent on Orange 3G.
Car phones and sim cards - JamesH
I have car with a sim slot and built in car phone with a handset & handsfree. Very 80s/early 90s, even though this is a 2002 car and even the current models only offer this (still at high cost) instead of a more up-to-date Bluetooth soluition.

I bought a Vodafone PAYG sim for £1 (it only accepts GSM900 e.g. Vodafone/O2) keep it in the slot all the time and divert my normal phone to it when it's worth it (long enough journey or expect a call - if I forget, I'll just let the mobile ring). I have set my mobile (a SonyEricsson K800i) to have the right jab on the joystick be the All Calls Divert shortcut. It always defaults to the last number used, so just unlock, right, ok, lock and that's it diverted.

I have more free minutes on my contract than I can use, so there's no divert cost for me. I don't make many car calls either so not too fussed about the PAYG call charges.

That said, I have a Parrot CK3100 in the other car that is so much better. I don't have to touch the phone, it connects automatically.