I live in an area at the edge of a 4G HSPA service area. My husband has a Samsung GII and gets unreliable service. Could you recommend a phone for better strength in a weak area? I would replace my landline and get a cell for myself if it would be reliable.
Try an older BB like the Bold 9900. They had better signal strength than most phones. When I had one on Telus for my manager line in Uxbridge, my ex's house was a huge interference for cell signals on the Bellus network (Rogers forget about it) but the 9900 squeaked through a few bars. You might have to buy it secondhand/online but it's worth a shot.
Otherwise most phones would have generally the same reception quality, or at least better than Samsung.