SIM CARD Nextel i730 to i580

Answer 1

guest198  is unfortuantely not giving very accurate info.

"Insert SIM" is purely an equipment-related problem.  It is not and can not be associated with services (like someone else's number being assigned to the chip or you needing to call in to swap your number to the phone - for "insert SIM," these are NON-issues)

Insert SIM means that the phone cannot "find" the sim chip.  That breaks down to either the chip is having a problem and cannot be read, or the chip is fine but the phone has a problem preventing it from reading the sim.

The i730 uses a 64k chip while the i580 uses a 128k chip.  So they are different.  However, an i580 can function with a 64k chip - it might not be able to read the phone list, but you should be able to make phone calls and it would definitely recognize it as being there (as opposed to telling you "Insert SIM (cause I dont think there's a sim chip in me")  64k chips have a sim id ending in 310.  128k chips have a sim id ending in 330 - the 15-digit sim id is printed on the sim chip.

So... back to the 2 causes of the problem

--make sure the sim chip is in the phone with the metal part facing towards the phone and the cutout corner matching the cutout corner of the slot for it
--try cleaning the metal part of the sim chip with an alcohol pad or q-tip dipped in alcohol.  Sometimes they get a little corroded

you could try sliding the sim in & out a bunch of times - if the contacts within the phone are corroded, the friction might clean them off a bit.

It could, however, be that the SIM chip simply doesn't work anymore or there is a component in the phone which has failed, leaving the phone unable to read the chip.  If you still get "Insert SIM" after trying the above suggestions, take it to a Service Center.  They can repair the phone, replace the chip, replace the phone, or replace the entire unit.