Access notes from a blocked iPhone

I have an iPhone 5 and its blocked for Guatemala Tigo.
I have been using the r-sim 7 without problems until I came to the US for a business trip.
Instead of getting the roaming charges I decided to get a prepaid AT&T SIM.
In the instant I put the AT&T sim, the phone detected that it was not a valid and it blocked.
I have some important notes there that I would like to get. I know that they are there, I was able to access my contacts and my music and reminders. But I was not able to access my notes.
There is any soft I could use to get the notes?

Thanks