Verizon coverage is very good around the lake. I have Verizon and no issues with coverage around the lake. The coverage maps from Verizon Wireless show digital coverage throughout the lakes region. AT&T Wireless is the pits. I used to work for Alcatel and AT&T Wireless was a large customer. As such, all the corporate cell phones were AT&T Wireless. I used to lose coverage at the intersection of route 3 and route 495 in Chelmsford.
AT&T Wireless has some cool handsets, but their network is poor both in coverage and speed. AT&T Wireless is spending on implementing HSPA as an interim play. They will not be doing LTE for quite a while, so their network will continue to lag Verizon Wireless.
If I had to have AT&T Wireless, I would put a femto cell in my house for coverage.
Jetskier