iPhone 4 - Wifi is very slow on new modem.

hello everyone.

today, got new modem charter isp, motorola, , router d-link, model dir-615. after getting new modem, noticed wifi on phone only, very, slow. else seems work fine though. am, , have been running wap on router, , switching wap2 did not improve it. have reset both router , modem, didn't help. phone on ios 5.1 , tethered jailbreak, don't should matter because on old modem work fine.

in advance,
veksin.

 

perhaps it's new modem

 

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