Test unlocked iPhone

[caliguy1965]

Hi,
I unlocked my 1.1.1 but don't have a sim from another provider, how can I test to see if it is unlocked. I used a sim from another at&t phone (non iphone) and that worked..........is that it?

Thank you,
Cali

[jav6454]

Hi,
I unlocked my 1.1.1 but don't have a sim from another provider, how can I test to see if it is unlocked. I used a sim from another at&t phone (non iphone) and that worked..........is that it?

Thank you,
Cali

Just get a friend who is on T-Mobile to lend you their SIM to verify