Yes, check how much the roamers advance the frame and then advance it with the radio until you are on frame 16.If you still have two or more roamers out, I'd find it easier to use them to check your seed rather than phone calls; that lets you do the RNG abuse in Lance's room. Then use the radio to advance the frame.
Use the lower-right radio station as that is the most consistent one.
Advancing the frame before you enter the E4 should only be done if you have to get a really high frame or if you are too lazy to count to 236 in my case.