Where are the Verizon network guys when you need them?

Britney Spears has lost the right to see her two sons — simply because her cell phone reception isn’t good enough, In Touch has learned exclusively.

Court-appointed drug-testers couldn’t reach the pop princess to schedule a random test, so the judge in her custody case yesterday once again banned her from seeing the boys — Sean Preston, 2, and Jayden, 13 months.

Britney, 25, blames poor reception at her home in Malibu, insiders tell In Touch, saying she simply didn’t get the call.

For now, the kids will spend their time with their dad, Kevin Federline, 29, at his home in Tarzana, Calif.

But it could soon change — if Britney gets herself a better cell phone. The next scheduled hearing on the case is set for October 26.