I only own a E72 but looking at gsmarena.com specs for the E70, I see the American version has no 900MHz capability. It is 1800MHz capable, which may be unavailable in the location you are in? Check with your local network operator and ask where their 1800MHz coverage is found.
Hope that helps.
The evolution: Morse code key->Qualcomm 860->Qualcomm 2760->Motorola Accompli 008->Motorola Accompli 009->Motorola mpx200->Motorola mpx220->Samsung i607 Blackjack I->Samsung i617 Blackjack II->Samsung i637 Blackjack III->Nokia E72 & E73 Mode (good riddens Windows Mobile....not so fast!)