iPhone won't connect to internet My iPhone SE connects to my WiFi/router/modem (WRM) fine, but it says "No Internet Connection".  I've never had this problem with my iPhone before.

Two other laptops connected to the same WRM access the internet just fine.  Logging on to the modem, I see all three devices connected to the WRM.

I followed an Apple page and PC World page, cycling the power on the phone, then resetting the network connections.  After logging back on to the WRM, I get the same lack of internet access.

If I use the phone instead of the laptops to log into the WRM using its numerical http address, it times out.  I don't even get to the page for entering user name and password.

Here are one laptop's data from ipconfig /all:

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix  . : 
Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
Physical Address. . . . . . . . . : 00-26-B6-FC-01-C6
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.1.101(Preferred) 
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled


Here is the other laptop:

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix  . : 
Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6235
Physical Address. . . . . . . . . : C4-D9-87-13-CE-5A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.1.103(Preferred) 
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 2019-01-27 19:53:16
Lease Expires . . . . . . . . . . : 2019-01-31 00:14:54
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
                                    0.0.0.0
NetBIOS over Tcpip. . . . . . . . : Enabled


The data from the iPhone is

Configure IP: Automatic
IP Address: 169.254.184.137
Subnet Mask: 255.255.0.0
Router: &lt;&lt; blank &gt;&gt;


I can't help but notice that the Subnet Mask is different, and the IP Address is very different,

What else can I try?

My WRM is the TP-Link TD-W9970.  My iOS version is 12.1.2.  I don't recall approving an update recently.  There is apparently a version 12.1.3 available, but without connectivity, I can't install it.
Apparently, DHCP is not enabled on your laptop, but it has the right configuration, so I figure either DHCP must have been disabled on your router recently, or your phone was configured with static addresses which got cleared recently.

For a quick fix, try filling in the Router, IP address, and subnet mask fields on your phone after choosing Manual for "Configure IP". Something like:

Configure IP: Manual  
IP address: 192.168.1.123  
Subnet Mask: 255.255.255.0  
Router: 192.168.1.1  


But you probably want to fix the settings on your router so you don't have to configure every device that connects to your network in the future.

Look for a setting that enables DHCP in your router's administrative interface, possibly on http://192.168.1.1