hi,i have a us fb ads account i was running campaign on it,but the spend limit is $50. i heard it can increase to 250 by add a phone,since i am not living us,so i bought a chinese cell phone to add in it. it was growed to 250,but after 5 minutes,i cant login any more. questions, how can i increase the limit? must need a us phone for us ad account? if yes,where i can get them,thanks.