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Cellular Phone Forum / Providers / Fido / September 2005help: life of sim card question
how long will a sim card stay alive after it runs out of money? bill >how long will a sim card stay alive after it runs out of money? 180 days after the expiration date (which is not the same as when you don't have money in your account.) - - That is if the sim card is inside the phone. If you take it out, it only least around 30 days. >>how long will a sim card stay alive after it runs out of money? > > 180 days after the expiration date (which is not the same as when you > don't have money in your account.) > - - >That is if the sim card is inside the phone. If you take it out, it only >least around 30 days. And just exactly how is the system going to know whether or not you have removed your SIM from the phone if the phone is off? Makes no sense at all. 180 days from the last expiry date on your account the account will be deactivated and if you want to use service you'll need to purchase a new SIM. Whether the SIM is in or out of the phone makes no difference to the system at all. And what is "least around 30 days?" >>>how long will a sim card stay alive after it runs out of money? >> >> 180 days after the expiration date (which is not the same as when you >> don't have money in your account.) >> - - - - I think he asks the sim card's lifetime, not the phone # lifetime. The sim card needs the power from the phone to hold the data. You can take your sim card out from the phone for a few weeks and c. It is better now, few years ago, it only last 48 hrs. Egghead > >That is if the sim card is inside the phone. If you take it out, it only > >least around 30 days. [quoted text clipped - 14 lines] > > - - >The sim card needs the power from the phone to hold the data. You can take >your sim card out from the phone for a few weeks and c. It is better now, >few years ago, it only last 48 hrs. You really don't know do you? You're making things up as you go along. I have my Fido SIM *out* of my phone for months and re-insert the card in a phone and it works just fine. You're going to have to make up another answer. - - > You really don't know do you? You're making things up as you go > along. I have my Fido SIM *out* of my phone for months and re-insert > the card in a phone and it works just fine. You're going to have to > make up another answer. SIM cards have flash memory, just like USB flash drives. Barring an electromagnetic pulse or really impacting them hard into something (which is tough since they weigh nothing), the memory should last indefinitely or until the electronics in the card fail (e.g. due to static electricity). Jim >> You really don't know do you? You're making things up as you go >> along. I have my Fido SIM *out* of my phone for months and re-insert [quoted text clipped - 6 lines] > indefinitely or until the electronics in the card fail (e.g. due to > static electricity). After that funny "they lose data after a few weeks" remark I did a bit of googling to see what the current state of smart cards / SIM cards is these days. SIM cards have a CPU and RAM on board as well as the flash memory. Some of the information I found talks about detection of IR and RF and other intrusive ways of subsersively getting information from the card which is *protected*. Once this 'break-in' is detected, the card wipes the memory clean. I wonder if people who have card failures are actually experiencing a 'feature' of the card because they have exposed it to some evil radiation that starts the suicide routine. >> You really don't know do you? You're making things up as you go along. >> I have my Fido SIM *out* of my phone for months and re-insert the card [quoted text clipped - 5 lines] > is tough since they weigh nothing), the memory should last indefinitely or > until the electronics in the card fail (e.g. due to static electricity). Sorry to nitpick, but indefinite is a LONG time! Flash type memory "stores" it's data in an insulating layer between the gate and channel of the storage transistor (often referred to as "floating gate"). Due to quantum effects every once in a while some charge is able to escape this area. Over the course of time less and less charge remains, until reading of that data element reads the wrong data. Now, with that said, the time spans we're talking about are very long, at least more then 10 years, possibly much longer. But certainly shorter then "indefinite"! :) TTYL > Sorry to nitpick, but indefinite is a LONG time! Hey, hey, hey! I have the monopoly on pedantics. ;) Jim I do not make it up May not be the power, but mine was not working with fido after a months. I need to get a new sim card. No idea, may be Fido takes out inactive sim card # after 30days. Egghead >>The sim card needs the power from the phone to hold the data. You can take >>your sim card out from the phone for a few weeks and c. It is better now, [quoted text clipped - 6 lines] > > - - > I think he asks the sim card's lifetime, not the phone # lifetime. > > The sim card needs the power from the phone to hold the data. No, it doesn't. It's non volatile, no power needed. > You can take > your sim card out from the phone for a few weeks and c. It is better now, > few years ago, it only last 48 hrs. No it didn't. I don't know where you've gotten your information from, but it's completely wrong. SIMs use an EEPROM type technology, their data will "disappear" after around 15 or more years, but that will happen whether you power the chip or not (only way around it is to rewrite the data every decade or so). Now, what you MAY have confused things with is some phones store their numbers in their own memory, NOT the sim. Many phones that do this use a volatile type of memory. Some of them will loose it all if you remove the battery or let it deplete. Some have a backup battery (or super cap) so that you can remove the main battery for an amount of time. TTYL >I think he asks the sim card's lifetime, not the phone # lifetime. > >The sim card needs the power from the phone to hold the data. You can take >your sim card out from the phone for a few weeks and c. It is better now, >few years ago, it only last 48 hrs. Not to be argumentative, but I've had a SIM from a deactivated phone sitting in a box in my basement for about 14 months (give or take), I just tried it and it still contains it's account information and a phonebook. *shrugs*  SignatureAnatomy is something everybody's got, but it sure looks better on a woman. |
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