LCD 16x2 strange display

hello ma'am and sir,i have a problem to my lcd 16x2 it display a strange letters that cant be read. i use gsm shield and hex keypad ,whats the reason with this problem can you pls give me some advice :)

pls give me some advice

I would advise you to read this:- How to use this forum

It will tell you how to ask a question here.

I wish I could do the gyro joke here. OP should just post where the LCD was bought, images of wiring, unreadable characters and the code. Pretty much what Mike pointed out with the How to use this forum post. Do your homework if you want answers.