Can Apple reset my phone with only imei number?

My iPhone 5 as been lost iv got a feeling it's been stolen anyway it was my own phone and I had a sim only deal in it the problem is iv cancelled the sim and the phone as got a pass code on I don't remember the Apple ID or password as it was a spare phone I hardly used it's full of pics of holiday s and stuff wot I need to know if the parson who stole it can get past the pass code to see my pics and stuff? Is this possible also Apple support told me ther can factory restore the phone with imei number is this true will ther need the phone?

Computer ads and social media? Clueless?

W/a desk computer, I was browsing hotels in tripadvisor. I don't have a account w/them but i was searching hotels in anahaim. But i went to my instagram account on my iphone and it showed an ad for tripadvisor for hotels in anaheim. How does it know what i went on?

Should I get my child a cellphone?

My 7 year old son recently told me that he wants an iPhone, the first thing I asked him was "why?" He said because all his friends have phones and because they look fun." I grew up in the 90s and I played with toys, not iPhones so it was really sad to see him asking me this. He already has an IPad which his father bought him, and he is addicted to that so getting him a phone might be worse. And he insists on getting the newest iPhone, I have no idea how he even knows about iPhones, he even knows the prices. I guess he might search that up on his iPad? Anyways, what should I do? He wants it for his 8th birthday which isn't until September 7th, so I still have time to think about this.

IPhone no connection available for non internet Wi-Fi setting?

I have a few devices that connect to the phone via Wi-Fi given off by the device. It will connect to the network and then pop up with no connection available and disconnect. I assume since it is not an actual internet connection my phone is not allowing it to stay on the network. Is there a way to change this setting or bypass the problem?