How to Reset an Old Nokia Phone (N73, 2100, 3310) After the Nokia Company Moved On

I reset old Nokia phones for a living on a very small scale. Actually, “for a living” is too generous; it’s a repair-and-resale side project that started because I found a Nokia 3310 that still turned on. The problem is that finding an old Nokia that still turns on makes people ask the scariest question in phone repair: “how do I reset it?”

I still document every old Nokia mistake I make. The list includes a Nokia N73 that I wiped when I meant to unlock it, a Nokia 2100 with contacts that weren’t on the SIM, and a 3310 that I forgot had a custom security code. None of those mistakes broke the hardware. All of them cost more than the phone was worth.

The surface problem: “old Nokia phone” is not one product

When people search “how to reset phone,” they want one easy answer. With Nokia, that answer doesn’t exist. Model matters.

The Nokia N73 shipped around 2006 as a camera phone running Symbian OS on Series 60 3rd Edition. The Nokia 2100 came a few years earlier as a basic display phone. The Nokia 3310 goes back to 2000. Putting a 3310 and an N73 under the same “reset” umbrella is like using the same instructions to restart a microwave and a laptop.

Search for “n73 nokia reset” and you’ll find threads that copy-paste a master code list into every answer. That list often includes the Nokia 2100, the Nokia 3310, and the N73 in one block. It looks efficient until you realize the person who wrote it never tested half of those codes.

What “reset” actually means on these phones

On a Nokia N73, “reset” can mean three very different things: restart the phone, restore factory settings from the phone menu, or run a full factory reset with the *#7370# code. Those three options have very different consequences.

When I first started doing old Nokia resets, I assumed a factory reset was software’s way of “taking a deep breath.” I changed that opinion after an N73 took the deep breath and forgot everything.

The Nokia 3310 and Nokia 2100 are simpler, but that creates another kind of confusion. People assume “simple phone” means “simple reset.” It doesn’t. These phones have settings menus, security codes, and phone memory with contacts that aren’t always backed up to the SIM.

So when someone asks me “how to reset phone,” I ask them what they are trying to fix. If the screen is frozen, resetting the software makes sense. If they forgot the lock code, a full wipe is overkill. If they are selling the phone, a reset might not erase the memory card. The word reset is hiding several different jobs.

The real reason reset help is such a mess: the Nokia company changed

Here’s something that most reset guides won’t tell you: the reason old Nokia reset instructions are so fragmented isn’t just age. It’s corporate history.

Nokia sold its phone division to Microsoft in 2014. HMD Global later started making Nokia-branded phones under license. The Nokia company that exists today does far more in network infrastructure than in Symbian support. When support content moved between companies, some documents didn’t survive the trip.

The Nokia company is not trying to hide the old manuals. It just no longer has a business reason to keep a support page for a 2002 feature phone alive. Searching for a Nokia 2100 manual now usually sends you to forum archives, random PDF sites, or Wayback Machine links. That leaves a dangerous gap: the authoritative instructions are missing, so the copy-paste code lists fill the space.

I get why. Supporting a twenty-year-old monochrome phone isn’t a smart business priority. But it creates a strange experience for someone holding a 3310 and wondering if a code from a random blog will turn it into a brick.

What a wrong reset actually costs

The sneaky part is that the phone usually survives. The reset completes, the screen lights up again, and the phone looks fine. What disappears is the data that made that phone worth keeping.

An old N73 can hold photos and messages that exist nowhere else. A Nokia 3310 or Nokia 2100 can hold contacts that were never moved to the SIM. If a reset hits phone memory, those records are gone. No iCloud, no Google backup, no undo button.

Another thing I see in the resale world: people assume a factory reset makes a phone clean. Usually it’s the opposite. A factory reset might wipe internal phone memory but leave a memory card untouched. The removable card is often where the private photos and files live. If you sell the phone after a reset but leave the card inside, you’re handing the next person more than a phone.

I learned that lesson on a Nokia N73 in a batch of old devices. The phone looked perfectly erased. The miniSD card in the side slot was not erased. It had photos from the previous owner’s home. The reset had made the phone feel clean, but the data was still sitting there.

How to reset an old Nokia phone (N73, 2100, 3310) without turning it into a paperweight

If you still want an answer to “how to reset phone,” here’s the short version. It’s not a magic code. It’s a small decision tree.

1. Pull the battery first. This fixes a lot of frozen old Nokias. Take the back cover off, remove the battery, wait about thirty seconds, put it back, and turn the phone on. That is the safest reset on any old Nokia.

2. Remove the SIM and any memory card before trying a hard reset. If your Nokia N73 has a miniSD card, copy the card’s contents to a computer before doing anything else. On a Nokia 2100 or Nokia 3310, the SIM might be the only copy of your contacts. Set it aside so a phone wipe doesn’t touch it.

3. Look for “Restore factory settings” in the menus before using a code. On basic Nokia phones, this option is usually somewhere in Settings. It is not always destructive the way a master code is. If you only need to clear settings or fix a weird configuration, start there.

4. Treat *#7370# like a heavy hammer. On certain Symbian phones, including the Nokia N73, this code can format internal memory and reset the device. Back up whatever you can first, remove any memory card, and make sure you actually want to lose everything in the phone’s internal storage.

5. Don’t guess the security code too many times. The default code on many old Nokia phones is 12345, but that assumes nobody changed it. If the previous owner set a different code, you don’t know it. Repeated guesses can lock the security process and turn a “someday fixable” phone into a “needs specialist tools” phone.

6. If you’re selling the phone, erase the memory card separately. A reset might not do it. Format the card using the phone’s storage menu or remove it and erase it on a computer. Don’t assume the reset cleaned every storage slot.

This is based on what I’ve seen working with these devices through early 2025. Firmware versions vary, and regional variants exist. If a forum post tells you “this code works on every Nokia ever made,” close the page and check the phone’s menu first.

The safest reset is the smallest one that solves the problem. Everything else should be a choice, not a guess.