Upvote:2
Your cheapest/safest option will probably be to buy a new wallet once you get to the Philippines.
Obviously, you should look for one that has a zipper pouch for coins or the like.
Otherwise, you might consider leaving your UK SIM at home!
Upvote:2
I usually put it in a zip-lock bag (always good to carry extra bags when traveling) and keep it with the rest of my electronics/chargers/etc...
Another option I've used is to stash it in one of the little plastic cases SD cards come in. Even if the SIM card is smaller than an SD card, it will be fine in there.
Upvote:3
I have a small collection of SIM cards and I use a SIM card wallet to hold them. They gave me mine at a China Unicom store, but I see these for sale in mobile phone accessory shops sometimes. This might be overkill for just one card, though.
SIM cards are tough, there aren't many ways to damage one (one of mine has been cut twice, normal->micro->nano size, with the plastic ground to nano thickness using a Dremel tool; it still works fine) and they (generally) aren't RFID responders so they aren't in need of much protection from anything. You only need to have a way to avoid losing the card and the tool you need to get the SIM tray out of the phone.
Upvote:3
Most SIMs come in wallet sized card, that you pop the SIM out of. I simply pop my regular SIM into the hole left in the card of the SIM I just bought (they usually are tight enough to stay), put it back in its packaging and store it in my briefcase with my electronic accessories.
When I leave, I simply reverse the process, which means I have the SIM details with it, in case I might be planning a return trip to that country in the not too distant future.
I always back up contacts, photos, docs before traveling somewhere that I am planning on getting a new SIM, cause sometimes while setting up you just push the wrong button :(