AVS Special Member
Join Date: Dec 2003
Location: Bethesda, MD USA
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Do you mean they both used the same addresses in their configuration, or on the phone & tablet themselves? Because if it's the latter then you have a big problem.
Each device on a subnet MUST have it's OWN unique IP address. More than one device CANNOT use the same IP address. So if your phone & tablet were on the same address then that needs to change. It's very likely you'll have to reset your routers and switches to clear the ARP tables (the behind the scenes protocol for resolving IP to MAC addresses). Most are capable of resolving this on their own but a power cycle (AFTER you correct the device overlaps) will certainly clear it.
Best bet, again, is to set as many things as possible to use static addresses but ALSO set up DHCP leases on the router for them. That way you have a 'belt and suspenders' approach to making sure devices will always been on the same addresses. Absolutely do this for fixed devices like printers, servers, DVRs, etc... things that won't change unless hardware is replaced. For tablets and the like it's not "as necessary" but it does help avoid a lot of potential problems.