Does anyone know if my Nextel 7520 SIM will work in a 7100i ?

I know the 7100i SIM does nto work in the 7520 but what about the other way around.

Nope. Get the correct SIM.

It comes with the correct SIM. Was hoping I could switch between the two devices at will.

yes.... the sim from a 7520 will work if you just switch it into the 7100i. i just did it a week ago because i bought a new 7100i.

but i think to recieve your emails you have to go into your settings in the BIS and change your device PIN and IMEI. thats what i did and it works great

The 7520 SIM will not support MMS messaging. It also will only hold 250 contacts should you decide to copy to the SIM. The 7100 SIM supports MMS and will hold 600.

Please tell me how you did this. When I switch sim card from my 7520 to 7100i, I get a sim card error message and nothing gets synced.

I have tried and get SIM error, will not work. I think this post is in error!