sim908 hardware issue

HI , now i finish from work in sim908 eval board, and every thing go fine , then i go to build my own PCB with sim908 module , i think is every thing fine with solder and pins , when i switch on the board , the LED keep blinking is same speed which mean it not connect to network . where is my issue . the bids only for one who have sim908 and have background on it .. the bidder, i will tell them how i make connection , and they should only only tell me where is my problem ... only this no design required .. thanks and regards