Your on Wifi, right? Is your phone system running on the 2.4ghz range (most newer wireless phones use that).
If it is, it will interfere with your wifi.
Get a new phone, or stop using wifi. Having a different router wont really help things, since wifi always uses the same airways.
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Kids in the back seat can cause accidents.
Accidents in the back seat can cause kids.
Moral: Drive a two seater