The sim card.
There is really no answer u don't a sim card.
No, only the 3G version needs a SIM Card.
Yes you can get the 8gb Psp Memory Card By Sony.
A TF card is a memory card and is not the same as a SIM card.
you have to put a sim card in every phone, if u e=want to save stuff
sims card error means your sim card is put in your phone wrong.
There is no where to put a sim card in an env touch. Only a micro sd card.
yes, as long as the i wireless sim card fits!
u put it uder the sim card ....
Put the SIM card from the new phone into the old one. Copy the contacts from the old phone's memory to the SIM card. Put the SIM car back in the new phone - then - either copy the contacts to the new phone's memory - or leave them on the SIM card. Either way - the new phone will find them.
Way 1- Get a plug n plug it into the computer, put all the memory onto a computer... unplug it then put in the other sim card n plug it into the computer n take all that memory u just put on the computer n move it on 2 the sim card Way 2- Buy a USB stick that u can insert a sim card into the end of it, then put the memory that u want on the sim card onto the usb stick