slow LTE SPEED on a verizon phone help!

vizion145

    hello, i have purchased a Verizon Iphone 6S but its giving me slow LTE Speed on my tmobile network. Im getting about 2-3Mbs and 0.19up. I read it could be fix through changing APN SETTINGS and change settings to IPV4/IPV6 but i cannot find it in settings. I believe after IOS9 you are not allowed to change it? If so, How can i fix these slow speeds if im not allowed to EDIT APN?! Thanks.

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